HEALTHY LIVING
03/24/2010 05:12 am ET | Updated Nov 17, 2011

Birth Weights Decline In U.S.

Birth weights in the United States are on the decline, a study has found. The report, released Thursday, found a small but significant decrease in average birth weights from 1990 to 2005, for reasons that scientists say are unclear.

The numbers, published in the February issue of the journal Obstetrics & Gynecology, mark a shift from earlier reports that noted a rise in birth weights in the latter part of the 20th century.

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