How to calculate the due date

Pregnant women are curious about when the baby will be born, which brings us to the due date. The due date is generally an estimate of the baby's birth date. Generally speaking, the baby will be born earlier than the due date, of course there are exceptions. There are many ways to calculate the expected date of delivery, generally speaking it is calculated from the time of the last menstrual period. The numbers added to the months and days are different.

The due date is calculated from the first day of the last menstrual period.

The calculation method of the expected date of delivery is: the expected date of delivery is the number of months from the last menstrual period plus 9 (or minus 3), and the number of days plus 7.

The last menstrual period was December 25, 2009, and the expected date of delivery is October 2, 2010.

A full-term pregnancy lasts approximately 280 days (about 40 weeks), and delivery within two weeks before or after the expected date of delivery is considered normal.

The due date is calculated from the first day of the last menstrual period, by adding 9 or subtracting 3 to the month and adding 7 to the day. Therefore, your due date is September 30, 2012. It is normal to give birth 2 weeks before or after the due date.

Since it is difficult for every pregnant woman to accurately determine the time of conception, medical regulations stipulate that the expected date of delivery is calculated from the first day of the last menstrual period. The entire pregnancy period is 280 days, 10 gestational months (each gestational month is 28 days). The month of the last menstrual period plus 9 or minus 3 is the expected date of delivery; the day plus 7 is the expected date of delivery. Suggestions: Because the cyclical changes in the endometrium are the cause of the menstrual cycle, the endometrium can only develop to a certain extent to allow the fertilized egg to implant, and only after the fertilized egg implants can an embryo be formed. From the first day of menstruation every month, a new menstrual cycle begins, so the gestational age should be calculated based on the menstrual cycle.

The calculation of the due date means that since it is difficult for every pregnant woman to accurately determine the time of conception, it is medically stipulated that the due date is calculated from the first day of the last menstrual period. The entire pregnancy period is 280 days, or 10 gestation months (each gestation month is 28 days, or 40 weeks).

Time Range

The due date is not the exact date of delivery. Scientists have calculated that only about 53% of women give birth on their due date.

The due date can remind you of the time range for the safe birth of the fetus, but don't take the due date too precisely. By the 37th week of pregnancy, you should be prepared for delivery at any time, but don't be too anxious, just let nature take its course. If there are no signs of delivery by the 41st week of pregnancy, you should be hospitalized for observation or induced labor if conditions permit.