Each month tells what you can expect as your pregnancy progresses. Also, you can find links back to information and tests that might take place during a particular month. Just click on the months to the left to go to the pages that contain more information on that particular month. Your health care provider will estimate the gestational age of your baby at one of your first prenatal appointments.
Gestational age is the age of an unborn baby.
It is measured in weeks and days, not in months. Since the precise date of conception is seldom known, the age is based on the date of the mother's last menstrual period. Forty weeks after the first day of the last menstrual period is the estimated end of a normal term pregnancy, or due date. The progress of a pregnancy can be judged as normal or abnormal only when the gestational age is accurately known. Gestational age is very important when complications occur in the pregnancy and early delivery may be necessary.