Pregnancy preparation knowledge science: calculation of the expected date of delivery

The most meaningful mathematical formula

The entire gestational period of a pregnant mother counts from the first day of the last menstrual period, a total of 280 days, that is, 9 months and 7 days. Then the calculation formula of the gestational period is: the month of the expected period of the solar calendar = the month of the last menstrual period + 9/-3; the date of the expected date of delivery = the date of the last menstrual period + 7. For example, if your last menstrual period is May 1, then your solar calendar due date month is 5–3=2, and the date is 1+7=8, which is February 8 of the following year.

It's such a simple addition and subtraction formula that can determine the most important days of your life. Happy pregnant mothers come and figure out what day your baby will be born. Maybe from that day on, your life with your father-to-be will add a lot of things, and you will also have to give up some things because of the arrival of the baby. This is the addition and subtraction of life: bland + small helplessness – small freedom + big sweetness = happiness.

It is normal to advance or postpone

The expected date of delivery calculated by pregnant mothers based on the date of their last menstrual period is not 100% accurate. Because this calculation formula has too many personality factors, such as inaccurate memory during the last menstrual period, different rates of baby development, and different activity levels in the third trimester, these will affect the accuracy of the expected date. In general, it is normal to advance or postpone two weeks later.

If the first day of the pregnant mother's last menstrual period is March 9, the expected date of delivery is December 16.

Perfect Father-to-Be Bootcamp: Reminisce about the beautiful "sex" with pregnant mothers and help pregnant mothers calculate accurate due dates. With the active participation of the father-to-be, pregnancy and childbirth will no longer be a lonely battle for pregnant mothers, which will greatly enhance the sense of security of pregnant mothers.