US birth weights on the decline

A study that analyzed data from 36,827,828 US babies born at full-term between 1990 and 2005 has found that birth weights decreased by up to 79 grams (2.78 ounces) during that time frame. The decreases could not be explained by changes in maternal or neonatal characteristics or trends in obstetric care practices such as cesarean sections or induced delivery.

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