What is the best way to calculate the standard date of birth?

The article was consulted professionally by Bsck II Pham Thi Tuyet Mai – Obstetrics and Gynecology Department – Share99 Hai Phong International Health Hub.

To calculate the exact date of birth, pregnant women can apply many ways, corresponding to many different times. However, the results of the date of birth are completely changeable and there is not a fixed milestone maintained throughout the pregnancy.

1. Is the date of birth correct?

In theory, the woman's gestation period is 9–10 days, however in reality this figure is not entirely accurate for all pregnant women. The reason is that pregnancy also depends on many different factors, such as the time of medation of the fetus, the time of the mother's last menstrual cycle … Therefore, the result of calculating the date of birth of each person is not the same. Moreover, the expected date of birth of the mother is completely changeable and does not remain fixed throughout the pregnancy.

Calculating the most standard date of birth is considered to be the most accurate estimation of the date of birth of a fetus about 40 weeks old, not necessarily the day the baby is born to be called normal. Statistics show that, despite being calculated by the doctor the exact date ofbirth , in fact only about 1/20 of pregnant women give birth on this day, the rest of the babies are born earlier or later within 1-2 weeks.

Pregnancy beyond the date of birth

Each fetus will have a certain date of birth

However, knowing how to calculate the most standard date of birth will help pregnant women get a specific milestone and better psychological preparation to welcome their baby when the pregnancy is enough to give birth.

Each fetus will have a certain date of birth, usually counted in the 3rd month of pregnancy. Which date of birth is most accurate depends on many different factors throughout the pregnancy. If the maternity has been examined in many different places, on many different occasions but doctors calculate the date of birth differently, the pregnant woman should look for a reputable place of pregnancy examination, ask a specialist doctor to check carefully and choose which date of birth is most accurate based on the existing results (usually ultrasound).

In detail about the development of the fetus week by week, every parent should find out:

2. The best ways to calculate the date of birth

2.1. Calculate the date of birth according to the menstrual cycle

To calculate the standard date of birth,pregnant women can count based on the first day of the last menstrual cycle, with the calculation: Take the first day of the last menstruation as a milestone, plus 7 days, then add 9 months, will give the expected date of birth. For example, the first day of the last period is 21.02.2020, the date of birth is 21+7, February+9, which is November 28, 2020.

In this way, gestational age is calculated based on the determination of the menstrual cycle. However, often no one can know the exact date of ovulation of oneself, as well as the time of conception, only the monthly day is the most accurate information, so medicine chooses this date to calculate when the baby is born. How this date of birth is calculated is not very dependent on the woman's menstrual cycle. Therefore, this method applies to women who have a regular menstrual cycle of 28 days and remember their last menstrual day correctly. Can not be applied to those who are having irregular menstrual cycles, menstrual disorders, incorrectly remember the date of the oncinal of menstruation.

Calculate the date of birth according to the menstrual cycle

Pregnant mothers can calculate their own date of birth according to the menstrual cycle

2.2. Calculate the exact date of birth according to ultrasound

Pregnant women can calculate the standard date of birth based on an ultrasound of the first 3 months of pregnancy. Accordingly, the ultrasound doctor conducts measurements of the fetal size, estimating how many weeks the current gestational age, thereby calculating the 40-week full day as the date of birth.

This does not need to be based on the date of menstruation or the time of conception. Ultrasound results showed that at the interval of pregnancy at 5 weeks of age it is possible to recognize a gestational pole, 6 weeks of age the diameter of the amniotic sac falls about 6-9mm, by 7-8 weeks will usually recognize the beat of the gestational heart. The date of birth is usually determined best based on the 12-week gestational week +/_ 7 days

For post-assisted pregnancy, the doctor will calculate the gestational age and date of birth based on the date of incubation, the date of transfer of the embryo or the date of sperm pumping.

In addition, currently, there are many softwares, applications and websites that help pregnant women calculate the date of birth in the most convenient and accurate way. Pregnant women who only need to enter all the necessary information (the first day of the last menstruation, gestational age or the date of the ultrasound) will know the exact date of birth.

Does pregnancy ultrasound affect anything

Method of calculating the date of birth by pregnancy ultrasound

Usually the duration of birth will be in the last 3 months of pregnancy. In addition to learning about how to calculate the date of birth, the first 3 months are the most sensitive time during pregnancy. In order for the mother and baby to be healthy, parents need to pay attention to the following issues:

  • Know the real signs of labor to get to the hospital in a timely manner, affecting the health of the fetus.
  • Distinguish amniotic fluid and vaginal discharge for timely processing, avoiding premature birth, pregnancy failure, still still death.
  • Special care when bleeding appears in the last 3 months of pregnancy needs urgent emergency to ensure the life of both mother and baby.
  • Monitor the amount of amniotic fluid regularly, continuously.
  • Monitor the weight of the fetus for the last 3 months to assess the development of the baby and the dosage of possible risks at birth.
  • The monitoring team is equally forward, the fetus is retested and needs to be closely monitored by a doctor and given appropriate direction.
  • Distinguish the psychological mound, labor mound and machine pregnancy to get to the hospital in a timely manner.

The full maternity service at Share99 makes the pregnancy process of pregnant women more gentle and safe. During the pregnancy process, pregnant women will be examined by leading doctors in the Obstetrics and Gynecology Department with high professional qualifications, experienced, giving advice and directions for the best treatment for the health of both mother and baby.

Dr. Tuyet Mai has more than 30 years of experience in examination and treatment in the field of Obstetrics and Gynecology, especially in lower-sugar surgeries, family planning, specialized laparoscopic surgery, handling many serious and difficult surgeries such as:

  • Hymenectar surgery, hymen patching
  • Uterine fibroid surgery, cervical cancer
  • Cervical cancer vaccination
  • Early detection of cervical cancer
  • Cervical in combustion
  • End noisy examination and treatment

For direct advice, please click hotline number or register online HERE. In addition, you can register for remote consultation HERE

SEE MORE:

  • 40-week pregnancy monitoring with no signs of birth
  • What to do when the pregnancy exceeds the date of birth and has not yet labored?
  • Should pregnancy exceed the date of birth?

About: John Smith

b1ffdb54307529964874ff53a5c5de33?s=90&r=gI am the author of Share99.net. I had been working in Vinmec International General Hospital for over 10 years. I dedicate my passion on every post in this site.

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