A vaginal delivery is the birth of offspring (babies in humans) in mammals through the vagina. A normal vaginal delivery (NVD) is a vaginal delivery, whether or not assisted or induced, usually used in statistics or studies to contrast with a delivery by cesarean section. The length of a normal pregnancy can be anything from 37 weeks to 42 weeks. So you have a five-week period when your baby could arrive at any time and it would be considered normal. If you give birth before 37 weeks of pregnancy, your baby is defined as premature and is likely to need extra care.
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Women's Health and Complications 