Lange, Donna; McDonnell, Mary Ann
November 2004
Taking Responsibility: A Teen's Guide to Contraception & Pregnan;2004, p62
This article focuses on the first trimester of pregnancy. Gestation is the time between conception and the birth of the baby, when the baby is growing inside the mother's womb. In human beings, pregnancy or gestation averages 266 days or forty weeks. This is 280 days or about nine months from the beginning of the last menstrual period. The gestation period is divided into three trimesters. Each trimester is three months. By attaching to the wall of the uterus, the developing baby is able to receive nutrition from the mother's glands and blood vessels within the uterine lining.


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