By LiveScience Staff
posted: 21 January 2010 05:02 pm ET
Babies born in the United States are getting smaller, according to a new study. The findings suggest that birth weights in this country have declined during the past 15 years, most dramatically among the least likely group of mothers.
The researchers estimate that birth weights for full-term babies have decreased by an average of 1.83 ounces (52 grams) between 1990 and 2005.
And weights were down even further in infants born to a subset of women considered to be at low risk for small babies: Mothers who were white, well-educated, married, non-smokers, and who received early prenatal care and delivered vaginally with no complications, had babies who weighed an average of 2.78 ounces (79 grams) less at birth during the study period.
The researchers don't know the reason behind the decrease in birth weights, and their study showed the rise in cesarean sections and inductions of labor aren't to blame.
http://www.livescience.com/health/smaller-us-babies-birth-weight-100121.html