How To Calculate The Date Of Birth

When going to the clinic, the doctor will conduct an ultrasound and clinical examination of the height of the uterus, the time of gestation and fetal heart ... to predict the gestational age. Besides, the mother can predict the baby's birth by the following ways:
Counting weeks of pregnancy
Normal pregnancy cycle is 280 days = 40 weeks

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You take the first day of the last period, check the calendar, see it on the day of the week (for example, 3rd). Then count all 40 of the 3rd that is due date.
Rule 9 October 10 days
Take the first day of the last period, count to the 9th month and then add 10 days
For example, the first day of your last period is 6/13/05, expected to be born on 23/3/06.




Nagele's Law (+ 7 / -3)
This is how to take the first day of the last period by 7 days and subtract 3 months.
This calculation is based on a 28-day menstrual cycle. For example, the first day of the last period is 13 - 7, so you will be born on April 20- next year.
Knowing your baby's date of birth is very important for pregnant women to prepare. But it's also important to note that this is an estimate, since normal pregnancies can vary from 38 to 42 weeks, meaning a 2 week difference is normal.
In fact, less than 10% of women say the correct birth date and half of all babies are born ten days earlier or after ten days according to the expected date.

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