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Docs get more precise about full-term pregnancy

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WASHINGTON (AP) — Mom-to-be closing in on her due date? The nation's obstetricians are getting more precise about exactly how close makes for a full-term pregnancy. On average, a pregnancy lasts 40 weeks, counting from the first day of the woman's last menstrual period. That's how a due date is estimated. A baby is considered preterm if he or she is born before 37 weeks of pregnancy....