What Newborns Weigh
Just like adults, newborns come in a range of healthy sizes. Most full-term babies (born between 37 and 40 weeks) weigh somewhere between 6 pounds, 2 ounces (2,812 grams) and 9 pounds, 2 ounces (4,173 grams). Their average length ranges from 19 to 21 inches (48 to 53 centimeters).
A newborn who is lighter or heavier than the average range is probably perfectly fine but might receive extra attention from the doctors and nurses after delivery just to make sure there are no problems.
A number of things can affect a baby's size at birth. The length of the pregnancy is important. Babies born at their due date or later tend to be larger than those born earlier. Babies born prematurely are often smaller than full-term babies.
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