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Calculation based on the last monthly period using an online calculator
Gestational age calculator

How women's bodies change week by week

In the images you can see an approximate illustration of the baby's development inside the womb for each week. To the left of the images is short description fetal growth for a given week. You can find more complete and detailed information by clicking on the “More details” link, which is located under each description.

The pregnancy calendar by week is very convenient.

Knowing how pregnancy progresses week by week is not only interesting, but also very useful! The pregnancy calendar will help you with this. It is designed to keep the mother informed of all events in intrauterine development and help adjust nutrition and lifestyle during different periods of pregnancy. In addition, the pregnancy calendar allows you to calculate the expected date of birth.

Pregnancy calendar by week

It will facilitate medical supervision of the expectant mother and her baby, and will also provide answers to the most important questions that will certainly confront you: when the belly begins to grow, why you feel sick during pregnancy, how to recognize the first movement of the fetus.

Thanks to this calendar, you will not forget that the time has come to undergo screening, take tests, or go for a routine ultrasound. And as the due date approaches, such a weekly calendar will help you best prepare for the long-awaited event.

This pregnancy calculator will allow you to calculate how far along you are now, the date of future birth, the date of conception, and even the zodiac sign of the unborn baby and its zodiac animal according to the Eastern calendar. You will also be able to determine the age of the fetus, its weight and height, and how much time is left before birth. To do this you need to enter the date of the first day last menstrual period and the length of your menstrual cycle. In addition, our calculator generates a very convenient and practical pregnancy table by week. Using it, you can figure out what week of pregnancy you are currently in, as well as track the height and weight of your unborn child.

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Pregnancy calendar by month.

By month

The monthly pregnancy calendar will become your guide to all 40 weeks of pregnancy. Every expectant mother will be able to leave her reviews, observations, share experiences and useful information here. Together we will watch how quickly our babies grow and develop! And give advice on the right lifestyle, diet and safe treatment of all sorts of ailments.

Each month of pregnancy is characterized by serious changes in the development of the child: he achieves greater success in physical and mental development, the baby’s brain grows rapidly, becomes stronger muscle mass, vital organs and systems and even the first natural skills are formed! The pregnancy calendar by month will familiarize you in detail with these events at each stage.

Personal pregnancy calendar

Every woman can keep a personal pregnancy calendar. Moreover, it is welcomed and recommended. After all, now you are in a very special state. Many sensations are new to you, and can even cause worries and fears - the body of a pregnant woman undergoes enormous changes, both in the physiological sense and in the psychological sense.

The pregnancy calendar by week and month is compiled with an attempt and purpose to explain each of them.

You can keep a personal pregnancy calendar in a separate notebook, which you decorate in accordance with your mood, tastes, experiences, as well as whether you are expecting a boy or a girl. Such an album will be an excellent start to a family chronicle or a chronicle of the life of your heir.

Interactive pregnancy calendar

But in addition, modern expectant mothers resort to the Internet and choose an interactive pregnancy calendar for observations. It is convenient, easy to use, accurate, practical, informative and completely free!

You can resort to its help when you need to quickly determine the date of birth or accurately determine the current stage of pregnancy (using a special calculator for this), divide your pregnancy into trimesters, months or weeks.

Online pregnancy calendar is becoming increasingly popular. Women want to know more about this special period: what are the first signs of pregnancy, how to avoid miscarriage, what to do with increased uterine tone, how to recognize the first warning signs of labor, how to determine the sex of the child. The calendar will contain articles, tips, explanations, as well as a calculator for determining the duration of pregnancy and the expected date of birth.

You can conduct personal monitoring of your own pregnancy, your condition and that of your child, and carry out calculations that interest you.

Online pregnancy calendar - at your service! Keep your finger on the pulse of the most important events in your life!

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How to correctly calculate the gestational age by weeks and days

Obstetricians-gynecologists begin counting the pregnancy period from the first day of the last menstruation. Usually the actual period is 13-16 days less, since conception occurs approximately in the middle of the menstrual cycle, i.e. at the time of ovulation. However, to avoid confusion, doctors start counting the gestational age 2 weeks before the date of conception.

Having discovered that a long-awaited pregnancy has arrived, many women experience a surge of enthusiasm and at the same time a desire to learn as much as possible about their new condition. Since changes in the body of a woman expecting a child occur constantly, it is very convenient to calculate the pregnancy calendar by week and monitor your condition by referring to it.

Calculate pregnancy calendar and gestational age

To calculate the pregnancy calendar and due date, special online services have been created. Using our calendar is simple: just enter the date when your last period began in a special window - and in a few seconds you will become the owner of a personal calendar. The calculator will break down the duration of your pregnancy into weeks, indicating the time frame for each of them: the start date and end date of all weeks of your pregnancy separately.

This is very convenient and useful: by checking your personal calendar, you can adjust your lifestyle and nutrition, taking into account the needs of the body of the mother and child at different times. You will also know in which period the formation and development of your baby’s organs occurs, your own condition and well-being changes, and this will make it easier for the doctor to monitor the well-being of your pregnancy. In addition, with the help of this calendar it is easy to figure out when one trimester of pregnancy ends and the next begins.

Calculate pregnancy calendar and due date

This pregnancy calendar also allows you to calculate the approximate due date. It occurs at the end of the fortieth week of pregnancy.

Of course, absolute accuracy—up to a day—cannot be obtained with this or any other method of calculation, because the duration of the menstrual cycle for different women can fluctuate, and the length of gestation of a child is an absolutely individual indicator, despite the fact that there are average standards.

In any case, by calculating the pregnancy calendar by week, you will be able to find out what has changed in your body and what is happening with your baby in one week or another, as well as approximately when you can prepare for childbirth and expect the birth of the most beloved creature in the world !

When girls find out that they are pregnant, the first thing they do is try to remember or calculate the exact date of conception. This happens every time we are talking about a planned or unplanned pregnancy, in the presence of regular sex life. It is clear that everyone wants to know when exactly fertilization occurred. Interest flares up especially strongly when the emotional coloring of the long-awaited news begins to lose its intensity and brightness.

If in the first days the expectant mother and father fly on the wings of happiness, then later, when they return to their natural state, they express a desire to find out when their baby will be born. Such a desire is quite normal. It is due to banal human curiosity and a number of practical goals. Expectant mothers are trying to calculate the date of birth using the date of conception on a calculator, as they are terribly interested in:

• when conception occurred (it is likely that this affects the determination of the child’s father);
• in what month should we expect the baby to appear?
• when to start purchasing things and clothes for a future family member;
• which name is better to choose, according to church calendar or astrological laws;
• where and when to plan a family vacation before the birth of a child.

There are so many life situations, so many different interests in pregnancy. Despite various reasons, information about the upcoming birth worries all responsible mothers, without exception. The very first thing they try to remember is the very moment of conception itself. Then they frantically add 9 months. The knowledge that it takes about 9 months to bear a child is completely insufficient. And few people know how to count “approximately nine months”:

• From what day exactly do we count - the day when sexual intercourse was performed, when there was ovulation, the last menstruation?
• Should we take calendar months or those called conventional months (thirty days each)?

When a girl experiences pregnancy for the first time, a period of 9 months seems incredibly long and completely uncertain. It’s clear that you want to calculate the date of your upcoming birth as specifically as possible. And this is necessary not so much for solving some practical family problems, but for timely monitoring of fetal development.

As experts note, by remembering the day when sexual intercourse was performed, knowing certain individual characteristics characteristic of the body, one can indeed determine the day of conception. This is very important for couples who are planning a pregnancy, visit planning centers, consultations, keep diaries of menstrual cycles - they approach the birth of a child responsibly and competently.

What should those girls do who cannot remember the date of conception, who are confused about days, partners and generally do not remember when the “fateful” sexual intercourse was performed? If you cannot accurately name the day when fertilization may have occurred, calculating the day the baby will appear will be problematic. But, nevertheless, there are several ways to find out the EDA (estimated date of birth).

There are different options that allow you to calculate a relatively accurate (or at least approximate) date of birth:

• own calculations;
• online calculator;
• examination by a gynecologist;

Surprisingly, no matter which option you decide to choose, each of them contains similar principles and algorithms. Therefore, you can safely start with your own “research”, then use a virtual calculator and then confirm your guesses with the competent opinion of a doctor.

Determining the gestational age by the date of conception and ovulation

Many girls use personal conception calendars, with which you can calculate the approximate date of delivery based on the date of conception. Some couples who decide to have a child try not to miss the most favorable days for fertilization. Therefore, they strictly monitor ovulation and try to have sex on important days. And it is right. When there is an understanding of how conception occurs, the likelihood of a baby being born increases significantly. It is important to imagine in detail how the process of childbirth occurs in the female body:

• after menstruation, vesicles form in the ovary, in one of which a female egg appears;
• it reaches the peak of its development and is released, rupturing the follicle;
• towards the uterus, the cell can be fertilized by a sperm if favorable conditions are created for this (knowing the day of fertilization, it is not at all difficult to calculate the date of birth based on conception);
• after a week (7 days), the fertilized egg is implanted into the uterus;
• the fetus—the unborn child—begins to grow and develop inside the uterus;
• further changes occur in the woman’s body: the mammary glands swell under the influence of progesterone.

As soon as the expectant mother realizes that she is in interesting position, she, as a rule, sits down to calculate the expected date of birth, draws up a pregnancy calendar, goes to the clinic to take tests and find out the doctor’s advice. You can calculate the due date based on the date of conception in a few minutes if you know when ovulation occurred and if you remember when sexual intercourse took place.

Difficulties may arise in cases where partners enter into intimate relationships every day. Here we need to remember that fertilization can occur only at the moment the cell is released from the follicle membrane, when it has passed into the sexual tract. This process does not last long, and therefore serious errors in calculating the due date based on the date of ovulation are excluded.

Determining the gestational age based on the last menstruation

You can also calculate the day of birth using your last menstruation. This method is relevant when the expectant mother does not know the exact day of ovulation. To calculate, you need to take readings from your cycle. Look at your personal women's calendar and calculate your future due date using data such as:

• Cycle duration. The girl needs to count the exact number of days between cycles. It is advisable to analyze the last 5-7 months. The normal female cycle is 28 days. But individually, the cycle can vary from 21 to 33 days.
• Systematicity of menstruation. Comparing the obtained figures with each other, you will see that the cycles are approximately equal. Deviations of 1-2 days are allowed. One-time shifts, which last for weeks, represent a deviation from the norm. Such failures are possible against the background of stress, illness, climate change. Alternatively, they may be caused by the use of hormone-containing drugs. There should be no reason to worry; this happens to many women. When regular shifts of 5 or more days are observed, we are talking about an irregular rhythm. And here it is worth seeking advice from a gynecologist. Only a doctor can help identify the cause of the problem.
• Duration of menstruation and their characteristics. The norm is considered to be discharge that is of the same type in abundance, duration and structure. Doctors say that the length of the menstrual cycle affects the due date. Let’s say if it is more than 28 standard days, then the pregnancy will be more than 40 weeks. When deviations in one direction or another are more than 5 days, errors are made in the calculations.

If there are certain failures and deviations from the norm, it will be difficult to calculate the due date using menstruation and conception. If we are talking about a regular female cycle lasting, say, 28 days, then we can determine the middle of the cycle: 28 divided by 2. On the 14th day from the start of menstruation, ovulation occurs, which is the moment of conception (its date). As you can see, creating a birth calendar and calculating the day of future birth yourself based on the date of conception is quite easy. If you want to accurately find out the maximum period for menstruation, you need to determine the specific moment of release of a mature egg. There are 4 ways to do this:

• Ovulation test. The pharmacy sells tests to accurately determine cell yield. According to the instructions, the strip needs to be dipped in urine for a few seconds and examined how the color of the reagent has changed, which shows the concentration of the peptide (luteinizing) hormone responsible for the rupture of the follicle
• Microscope. We are talking about a reusable device with which you can examine the patterns of salts contained in saliva. By the time the cell appears, the pattern becomes similar to a fern.
• Vaginal discharge. When the follicle develops, vaginal mucus does not come out, as it has a fairly thick structure. At the moment of “birth” of the egg, it liquefies and is released in large quantities (color - egg white). Such secretions can exist until the moment when the cell dies.
• Painful sensations. In the area of ​​the ovary, unpleasant sensations are possible, because a ruptured follicle is a common wound that can cause pain. A woman who knows her body perfectly and monitors her sensations will never miss the day pain appears. And already relying on this knowledge, you can calculate the date of birth based on conception.

As you can see, the second method is closely related to the first. To some extent, they complement each other.

Determination of gestational age by a doctor based on the results of a gynecological examination

At your doctor's appointment, be prepared to hear questions related to your last menstruation, its duration, characteristics, etc. The gynecologist, who has confirmed the presence of pregnancy, is obliged to ask on what dates the last menstruation took place, when it began, and how long it lasted.

In some cases, gynecologists determine the date of conception by a delay in menstruation. Therefore, every self-respecting girl and woman must keep a calendar of cycles, not forgetting to indicate the beginning and end in it Women's Day. Paying attention to yourself and your health can help in establishing a more accurate PDR. For some reason, some expectant mothers are convinced that only a gynecologist who observes the expectant mother can determine the exact date of delivery. But in reality, the specialist bases his calculations on the same data that were named in previous methods for calculating the MDR. Even if you decide to change doctors, the new gynecologist will ask you:

• when did your period start?
• what was the duration of the menstrual cycle;
• how systematic were the periods, were there any failures or any deviations.

These criteria form the basis of the study of the expected day of birth. In many cases, this day coincides with the PDA, calculated according to the date of conception online. Sometimes there is a slight error of one or two days, the reason for which is unaccounted for moments, the “human” factor. After performing a gynecological examination, the doctor may call PDR. An experienced gynecologist determines pregnancy “by touch.” He studies the shape of the uterus and its size (in all girls it is pear-shaped, but in expectant mothers the uterus is enlarged and presented in the shape of a ball). These indicators are quite sufficient to determine the PDR. Knowledgeable specialist who works with pregnant women every day can quickly calculate day X in his head. As practice shows, from the third or fourth week you can correctly tell how far pregnant you are. If you are pregnant for more than 3 months, it is almost impossible to find out the exact date, because all children develop according to an individual scenario.

Determining gestational age using ultrasound

Calculator calculations are often inferior to calculations of the date of upcoming delivery using ultrasound. An ultrasound examination allows you to find out the size of the embryo, and the doctor, comparing the results with the standards, talks about how the pregnancy is progressing. Could there be mistakes here? Undoubtedly. As noted earlier, all organisms develop differently, and therefore different girls can have embryos at the same time different sizes. And yet, determining PDR by ultrasound is considered the most reliable way.

Girls who have undergone an ultrasound examination before 12 weeks will find out the date of conception and delivery with a high probability (up to one or two days). Using ultrasound, doctors determine the duration of pregnancy in the 2nd or 3rd trimester, but the findings are not taken as a basis. The difficulty of determining the date of onset of labor is due to the fact that it is necessary to take into account the individual characteristics of fetal development, body composition expectant mother and many other factors. Therefore, if you want to know for sure on what day fertilization occurred, when exactly you will give birth to your little happiness, come for a consultation with a gynecologist early. He will tell you how far along you are pregnant and help you decide on the date of conception. It is possible that this will help you get answers to your questions.

Which of the above methods is the most effective?

Ultrasound is considered the most accurate method by which the PDR can be calculated. This method is the most reliable, as it shows high accuracy. The next most popular and accurate method is the method of counting day X from the day of the last menstruation. If the results of this method coincide with the results of the ultrasound examination, the chances of having a baby on the expected day increase significantly.

What to do if the dates according to the ultrasound and the last menstrual period do not coincide? First of all, don’t be too upset. The main thing is to monitor your health, regularly visit a gynecologist and undergo all examinations that he prescribes. Whatever option you choose to calculate the long-awaited delivery date, the result will not be 100% accurate. It is almost impossible to determine the exact day a baby will be born. A few mothers independently or with the help of a doctor set the correct due date.

It is important! Women carry their children under their hearts not for nine calendar months, as many believe, but for 40 weeks or 280 days, ten lunar months. Therefore, you should not add nine months to the date of conception. Some women give birth at 38 weeks, some a little earlier. And this is the norm. Future mothers of twins and triplets give birth earlier than the designated date. That is, in this case, it is important to understand that no matter what date you calculate, or what date the gynecologist calls, you can give birth to a child 1-2 weeks earlier or later. This is not considered a deviation.

The duration of bearing a child depends on many factors: the health and age of the mother, stressful situations, illnesses, all kinds of complications, polyhydramnios, the presence of high blood pressure or diabetes in the pregnant woman, the number of previous pregnancies, etc. Recently, unpredictable prematurity or post-term pregnancy has become especially common. That is, even theoretically it is impossible to know the reliable date when the child will be born. This is confirmed by statistics: approximately 17% of women give birth on the appointed day, the other 83% give birth a little later or a little earlier.

No experienced specialist can predict the exact onset of labor. Thus, it is simply impossible to find out and calculate the day of the upcoming birth with 100% probability. But you can find out the traffic rules. And the methods listed above will help you. With their help, you will certainly determine when conception took place (the approximate date of fertilization) and when the baby will appear. If you wish, you can use the virtual calculator for calculating the traffic allowance at any moment.

It will take you no more than two to three minutes to quickly calculate the due date based on the date of conception using this service. Many mothers, long before visiting the doctor’s office, first want to calculate the date of conception, and only then, having indicated the date of conception in the service, they will find out the date of conception. But it’s better, of course, to do an ultrasound. Tips and recommendations for those who consider the PDR on their own:

1. There is no point in getting hung up on calculating the due date; the probability of a 100% hit is low.
2. The expectant mother needs to mentally prepare in advance for the fact that childbirth may not occur on time.
3. If your female cycle is standard (28-30 days), then the due date calculated by your gynecologist will be close to the truth.
4. Women who experience problems with menstrual cycle, you should inform your gynecologist about this. Childbirth may begin later or earlier than the designated period (the difference will be as many days as your cycle is longer or shorter than the standard twenty-eight day cycle).
5. If the first time you gave birth exactly on time, this does not mean that everything will be the same with the second birth.
6. It is important to remember and understand: information on traffic regulations is needed first of all medical workers to identify possible abnormalities in the development of the fetus, assess the maturity of the placenta, monitor important indicators for the purpose of prompt hospitalization of the mother or stimulate delivery.

If your pregnancy is not planned, the first thing you should do is not panic. It will be difficult for you to make truly accurate calculations. Use any of the proposed methods and determine the date of conception. Having an idea of ​​the duration of the wait for the baby to appear, it is easier to calmly prepare for childbirth. Namely, calmness is the key to successful gestation. Live in faith: when your baby is completely ready for life outside of mom's tummy, then he will decide to come into the world. So, as soon as your pregnancy test shows two lines, rejoice: you will soon become a mommy. This is real happiness for any woman, take care of it.

Estimated date of birth(PDF) is the day when the pregnancy is exactly 40 weeks. Although a full-term pregnancy is considered to have reached a full 37 weeks, and in some cases a healthy full-term baby can be born at 42 weeks of pregnancy, it is still customary to focus on 40 weeks, since most births begin at this period.

Importance of Calculation expected date the birth of a baby is beyond doubt, and the point here is not only the desire of the parents to prepare for the arrival of a new family member. The medical side of the matter is also important. Let us list the reasons why a doctor managing a pregnancy needs to know the expected date of birth.

Fetal growth and development. It is important for a doctor monitoring the course of pregnancy to know how the developing baby corresponds in size to the gestational age (which is calculated based on the expected date of birth) in order to promptly diagnose such a serious complication as intrauterine growth restriction (IUGR), which is a consequence of placental insufficiency (pathology , in which the placenta does not fully perform the functions of providing the fetus with everything necessary for growth and development). Timely adequate diagnosis, and therefore treatment of this complication, is of great importance for the further full development of the baby.

Preventing pregnancy complications. During the observation process, the obstetrician remembers that at various stages of pregnancy the development of certain complications is possible, and therefore the time frame within which it is necessary to carry out diagnostic measures to identify complications, their prevention and treatment is determined (for example, prenatal screening - diagnosis congenital malformations of the fetus - must be carried out within clearly established periods of pregnancy, and if these terms are not observed, its diagnostic value is sharply reduced). For diseases such as diabetes mellitus and hypertonic disease– if the course of the disease worsens or treatment does not have a positive effect, there may be a need for delivery before labor begins on its own. Then the doctor needs to know in order to ensure the maximum possible degree of fetal maturity in a given clinical situation.

When to go to the maternity hospital

If there are indications for early hospitalization before delivery, it is important to correctly determine the timing within which the pregnant woman should go to the maternity hospital. Indeed, if hospitalization is too late (for example, on the eve of a planned caesarean section) there is a risk of not having time to carry out the required amount of examination and preparation for delivery, and too early hospitalization is not advisable, since a long stay of the expectant mother in the hospital can lead to an increased level of anxiety and stress on the eve of childbirth. The duration of prenatal hospitalization for various complications during pregnancy may vary. For example, when diabetes mellitus It is necessary to hospitalize a pregnant woman no later than 36 weeks. In case of transverse position of the fetus and placenta previa, the expectant mother should be in a hospital setting no later than 37 weeks (since during this period the processes of preparing the body for childbirth begin, which poses a great danger due to prenatal rupture of amniotic fluid in the case of transverse position of the fetus and the development of bleeding during presentation placenta). Women with breech presentation and anatomically narrow pelvis are sent to prenatal hospitalization at 38–39 weeks of pregnancy in order to have time to conduct a full examination, choose a method of delivery, and prevent post-term pregnancy.

How to calculate your due date

For determining expected date of birth Several methods are used.

Obstetric term(by date of last menstruation). It is generally accepted that the starting date of the menstrual cycle is the date of the first day of the last menstruation - that is, the full menstrual cycle is calculated as the interval from the first day of menstruation to the first day of the next menstruation.

For calculation expected date of birth There are two ways to determine the date of your period:

280 days are added to the date of the first day of the last menstruation (this is the average duration of pregnancy, counting from the date of menstruation).

Naegele's formula: 3 months are subtracted from the first day of the last menstruation and 7 days are added. For example, the last menstruation was on May 10 - subtracting 3 months, we get February 10, and adding 7 days, we get February 17 - this will be the expected date of birth based on the date of menstruation (we will assume that on February 17, the gestational age will be a full 40 weeks, and therefore, labor should begin around this time).

Embryonic term(by date of conception or ovulation). The probability of pregnancy is greatest on the day when ovulation occurs - the process of the release of a mature egg from the ovary. This usually occurs in the middle of the menstrual cycle (for example, if the menstrual cycle is 28 days, then ovulation occurs on the 14th day, and if the cycle is 32 days, then on the 16th day).

Considering that the egg is capable of fertilization within 24 hours after ovulation, and the lifespan of the sperm is on average 72 hours (in some cases it can reach 4-5 days), then the probability of fertilization is not 1 day, but much earlier - starting from 9 -10th day of the menstrual cycle (with a 28-day cycle). This circumstance makes it much more difficult to determine the expected due date based on the date of conception. It is possible to determine the due date by conception in cases where a woman knows exactly the date of ovulation (for example, she monitored her basal temperature or, for medical reasons, carried out ultrasound monitoring of folliculogenesis - the process of egg maturation). To determine the PDP, 266 days are added to the date of conception (since this is the true duration of pregnancy) or 38 weeks.

With a regular menstrual cycle (28 days long), there is no difference between calculations based on the date of the last menstruation and the date of conception, therefore it is most convenient and informative to determine by the date of menstruation.

By date of first appearance antenatal clinic . This method of determining the duration of pregnancy and childbirth will be as informative as possible if the expectant mother consults a doctor before 12 weeks of pregnancy. When registering, in order to verify the presence of pregnancy and determine its duration, the doctor will perform an examination on a gynecological chair to determine the size of the uterus. It begins to increase from 5-6 weeks of pregnancy and takes on a spherical shape. In addition, during pregnancy the uterus becomes soft (outside of pregnancy, the uterus is pear-shaped and has a dense consistency).

When determining the size of the uterus during a gynecological examination, the doctor specifies which gestational age corresponds to an enlarged uterus. For example, at 5-6 weeks the uterus becomes the size of egg, at 7-8 weeks - the size of a goose egg, by 12 weeks it reaches the size of a newborn’s head and its bottom (so-called top part uterus) it is already possible to palpate (feel) through the anterior abdominal wall without resorting to vaginal examination. Starting from the second trimester, the height of the uterine fundus can be used to approximately determine the duration of pregnancy: by 16 weeks, the uterine fundus is in the middle of the distance between the womb and the navel, by 24 weeks - at the level of the navel.

It is important to remember that what longer term pregnancy, the higher the error may be when determining it using this parameter, since the height of the uterine fundus depends on many individual characteristics: the number of births in history, the size of the fetus, gynecological diseases (for example, with uterine fibroids, the size of this organ will be larger than normal for given period), anatomical features of the expectant mother’s body, etc. Therefore highest value to determine the PDD by attending the antenatal clinic, an examination was carried out before 12 weeks of pregnancy - then the doctor will be able to determine the gestational age based on the size of the uterus.

According to ultrasound data. Determination of gestational age and expected date of birth It can be done quite accurately if an ultrasound is performed in the first trimester of pregnancy (up to 12 weeks). When conducting an ultrasound examination at the earliest stages (and it is possible to see the fetal egg by ultrasound from 3-5 weeks of pregnancy, the embryo begins to be clearly visualized a little later - starting from 5-6 weeks of pregnancy), the average internal diameter of the fetal egg and the coccygeal-parietal size are measured CTE of the unborn child. For each stage of pregnancy, there are certain CTE standards, measured in millimeters, by comparing which with the data obtained, you can quite accurately determine the expected date of birth.

In the second and third trimesters gestational age is established based on the measurement of certain dimensions of the fetus: such as biparietal size (the distance between the parietal tubercles, or the large transverse size of the fetal head), head circumference, abdominal circumference, diameter of the chest and abdomen of the fetus, length of the femur. The data obtained also allows us to judge the gestational age, but it must be remembered that the longer it is, the greater the likelihood of error. This is explained by the fact that as the fetus develops, depending on the characteristics of the pregnancy, the presence of maternal diseases, hereditary factors, the size of the fetus, by which the gestational age is judged, will vary significantly. One mother will have a child weighing 2600 g and a height of 48 cm, and the other will have a child weighing 4500 g and a height of 57 cm, which is completely normal, since all people have individual anthropometric characteristics. Thus, it is possible to determine the gestational age as accurately as possible using ultrasound data in I trimester of pregnancy or at about 20 weeks, when there is the greatest correspondence between the size of the fetus and the gestational age.

By date of first movement fetus PDP can also be determined by such a parameter as the date of the first fetal movement. In this situation, it is more correct to talk about the date when the pregnant woman first felt the fetal movements, since the fetus begins to actively move in the uterus from 8 weeks of pregnancy, the mother simply does not feel this due to the too small size of the child. It is believed that primiparous women first feel fetal movements on average from 20 weeks of pregnancy, and multiparous women - from 18 weeks, therefore, to determine the expected due date for this parameter, 20 weeks are added to the date of the first fetal movement in primiparous women, and 22 weeks in multiparous women.

It should be noted that this method definitions of traffic rules is considered additional, or auxiliary, since fetal movements are a very subjective sensation, and moreover, expectant mothers do not always notice it for the first time within the above periods. For example, first-time mothers may feel fetal movements for the first time later in pregnancy - after all, this is a sensation that is still unfamiliar to them, and at first they may confuse it with intestinal motility or simply not notice it. Women with a pronounced layer of subcutaneous fat may first feel fetal movements 1-2 weeks later. Multiparous women, on the contrary, may notice the first movements in more early dates(at 16-17 weeks), since they already know how it happens. These circumstances may reduce the accuracy of determining the expected due date based on the date of the first fetal movement.

For what calculate the maximum allowance according to several parameters?

The need to calculate expected date of birth according to several methods is simultaneously caused by the following factors. Firstly, despite the presence state-of-the-art methods Estimating the duration of pregnancy, predicting when a woman will go into labor (with an accuracy of the day) is almost impossible. Secondly, some data from which it is customary to calculate the expected date of birth may, for various reasons, be uninformative. For example, if you have an irregular menstrual cycle, calculating the gestational age based on the date of the last menstruation will not be accurate, and if you arrive late at the antenatal clinic, have gynecological diseases (uterine fibroids), or are overweight, it will be difficult to determine the gestational age based on the size of the uterus. Taking these circumstances into account, the doctor sets the expected due date based on the maximum amount of data to clarify the time interval in which labor is most likely to begin. As a result expected due date most often it is defined not as one specific date (for example, January 15), but as a time period (for example, from January 12 to 17).

However, even at the expected date of birth, which is correctly calculated based on all data, not all pregnant women begin, since the duration of pregnancy in each case depends on many factors. That is why the date of birth is called estimated.

Length of pregnancy, and therefore the period when regular labor will develop, are individual, and are also calculated based on the fact that labor will begin upon reaching a full 40 weeks, but the pregnancy is considered full-term after 37 weeks, so labor can begin in 2-3 weeks before the expected due date. A variant of the norm is the development of labor in the 41st week of pregnancy.

Thus, on duration of pregnancy and the timing of childbirth is influenced by many factors, among which an important role is played by the characteristics of the anamnesis - the age of the expectant mother, the number of previous births, the presence of miscarriages, premature birth and/or previous abortions, existing chronic diseases. In addition to these features, for a period onset of labor The characteristics of the course of a given pregnancy also influence. For example, during a multiple pregnancy, labor often begins earlier than during a singleton pregnancy, and the gestation period is inversely proportional to the number of fetuses (the more fetuses, the shorter the period), which is due to overdistension of the uterus. With the development of placental insufficiency (a pathology of pregnancy in which one or more functions of the placenta are disrupted, leading to insufficient provision of the fetus with everything necessary for growth and development), both early development of labor and an increase in the duration of pregnancy by 1-2 weeks are possible.

Despite the impossibility of absolutely accurately determining the date of birth, it is still necessary to correctly calculate the PDA. Focusing on the expected date of birth, the degree of biological readiness of the expectant mother’s body for childbirth (determined by a doctor based on a number of signs, one of the main ones is the degree of maturity of the cervix - the presence of biological readiness for childbirth is the key to the physiological course of labor and a favorable outcome for the mother and fetus) and condition fetus, the doctor will be able to promptly decide on the need for preparation for childbirth, prenatal hospitalization, drug treatment, etc.

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Congratulations!

There is little that compares to the joy of receiving a positive pregnancy test result! After realizing the wonderful news that you will soon become a mother, you will begin to think about practical issues. One of these questions is how to find out your due date?

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Defining it is not as easy as it might seem. Most expectant mothers don't realize they're pregnant until their first missed period, by which time they can be up to five weeks into their pregnancy. This means that simply counting nine months from the date of the pregnancy test is not enough, even if you try to take into account the weeks that have passed since your last ovulation.

It will be possible to determine the exact date of birth of your unborn child only if you remember exactly the day of the ovulatory cycle at the time of fertilization.

HOW TO USE A CALCULATOR TO DETERMINE YOUR CHILD'S BIRTH DATE

What you may not know is that menstruation and ovulation are considered the first two weeks of pregnancy. So it's no surprise that the calculations can be tricky, especially if your cycle is longer or shorter than average (28 days).

Although pregnancy typically lasts 40 weeks, your due date can depend on various factors. Our calculator takes into account the start date of your last period and the length of your cycle to quickly calculate your estimated due date based on your cycle length.

If you know exactly the date of conception, indicate it. The calculator takes into account the first two weeks that fall during menstruation and ovulation.

• 1.Specify first the first day of your last period, as well as the average length of your cycle. This is the number of days from the first day of one period to last day before the start of the next menstruation. If you know which one the day conception occurred select this option as an alternative.
• 2. Enter relevant dates to the calculator.
• 3. Then click To know!

Remember that the calculator calculates an approximate date, not an exact date. In the end, each pregnancy has its own individual characteristics.

WHAT TO DO WHEN YOU FIND OUT YOU ARE PREGNANT

By calculating the due date, you will know the approximate date of birth of the baby, and you can begin to prepare for it

If you haven't already, start by making an appointment with your doctor, who can confirm your pregnancy with blood tests and an exam and help you determine a more accurate due date.

At each subsequent examination, the doctor will determine the size of your uterus and monitor the development of the baby. The highlights of these exams will be when you hear your baby's heartbeat for the first time, as well as when you see it on the sonogram. As your pregnancy progresses, your due date may change.

Remember that throughout your pregnancy you should first listen to your doctor's advice. However, there are some things you can do yourself. Check out the rest of our site for more information.