U. S. Sen. Hillary Rodham Clinton, D-NY, and, former President Bill Clinton, blow out the candles on a cake at Hillary Rodham Clinton's 59th birthday party at Tavern on the Green in New York, Thursday, Oct. 26, 2006.
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 womanâs last period, not the date of conception which generally occurs two weeks later.
The average human pregnancy is 40 weeks long. However, a pregnancy is considered full term between week 37 of pregnancy and week 42 of pregnancy. Babies born during week 36 of pregnancy or earlier are considered preterm or premature. Babies born during week 43 of pregnancy or after are consider post-term or post-date.