How should the due date be calculated?

There are many algorithms for the due date, and my algorithm is that when the menstrual period is normal, it starts on the seventh day of the menstrual period, and adds 40 weeks, and the calculated date is the due date.

The due date is actually calculated from the time when you don't come to your aunt, and you can give birth at about 40 weeks.

The expected date of delivery is calculated from the date of your last menstrual period. This will allow you to figure out what your due date is.

Yes, that's what textbooks teach.

The fortieth week is counted from the first day of the last menstrual period.

Pregnancy is calculated from the day of the last menstrual period, while the due date is calculated based on the entire gestation period of 280 days. The specific method is: the expected date of delivery month Month 9 or 3 of the first day of the last menstrual period, the number of days of the expected date of delivery The number of days of the first day of the last menstrual period 7.

Of course, the expected date of delivery calculated in this way is not absolutely accurate, because the due date of menstruation is inaccurate (the expected date of delivery is calculated according to the menstrual cycle of 28 days), the fetal maturity time is different, as well as physical conditions and other external reasons, etc., will affect the advance and postponement of the child's birth date, and the so-called due date is only the approximate date of the child's birth. If the newborn is born 2 weeks earlier or later than the expected date of delivery, it is still considered a normal delivery.

That's the first day of your last menstrual period, plus 9 months and 7 days. For example, my last menstrual period was December 15th, and my due date is September 22nd. Gregorian calendar.

The specific algorithm of the due date is to add nine or subtract three according to the month, and add seven to the day, and the result is the day of the due date!

From the day your last menstrual period comes, the month is minus three, and the number of days plus seven is your due date.

Add 9 or subtract 3 for the last menstrual month and add 7 for the day. For example, if your last menstrual period is August 21, 2012, the due date is May 28, 2013.

Calculated from the day of the last menstrual period, the gestational week is 40 weeks (280 days), and some people use the method of month + 9 days + 7, but this calculation is not enough for 280 days.

Until now, if you are 12 weeks pregnant, the expected date of delivery is around April 18th, so please ask if you have any questions!

Counting from the first day of the last menstrual period, the month of the last menstrual date is added by 9 or minus 3 to be the number of months of the expected date of delivery; The number of days plus 7 is the expected date of delivery. Your due date is May 7th. B-ultrasound is based on the fetal femur length, double parietal diameter and other lengths estimated for the number of months, and the difference is generally one to two weeks.

Basically, it is 280 days from the first day of the last menstrual period.

There will be a B-ultrasound at 3 months of pregnancy, and that one will be more accurate. I just used b supercomputing, and it was only 2 days away from the actual one.