Study finds US birth weights inch down a bit

WASHINGTON (AP) -- U.S. newborns are arriving a little smaller, says puzzling new Harvard research that can't explain why. Fatter mothers tend to produce heavier babies, and obesity is soaring. Yet the study of nearly 37 million births shows newborns were a bit lighter in 2005 than in 1990, ending a half-century of rising birth weights....

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