How Is 40 Weeks Calculated
The Unborn Baby Spends Around 38 Weeks in the Uterus, but the Average Length of Pregnancy, or Gestation, Is Counted at 40 Weeks. Pregnancy Is Counted from the...
The unborn baby spends around 38 weeks in the uterus, but the average length of pregnancy, or gestation, is counted at 40 weeks. Pregnancy is counted from the first day of the woman’s last period, not the date of conception which generally occurs two weeks later.
How do you count your 40 weeks?
Most pregnancies last around 40 weeks (or 38 weeks from conception), so typically the best way to estimate your due date is to count 40 weeks, or 280 days, from the first day of your last menstrual period (LMP). You could also subtract three months from the first day of your last period and add seven days.
Is 40 weeks exactly 9 months?
Your 40 weeks of pregnancy are counted as nine months.