CHILDBIRTH

A normal pregnancy lasts about 40 weeks, or 280 days, after the beginning of the last menstrual period. Occasionally women go into labor before the expected date of birth, resulting in a premature infant. About 7 percent of all infants are premature—that is, born before the 37th week of pregnancy. Babies born just a few weeks early usually develop normally. Recent advances in the care of premature infants now allow many babies who are born after only 25 to 26 weeks of pregnancy to survive.

Delivery, the process by which the baby is expelled from the uterus through the birth canal and into the world, begins with irregular contractions of the uterus that occur every 20 to 30 minutes. As labor progresses, the contractions increase in frequency and severity. The usual length of labor for a first-time mother is about 13 to 14 hours, and about 8 or 9 hours in a woman who has given birth previously. Wide variations exist, however, in the duration of labor.

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