Updated guidelines for pregnancy and weight gain are largely unchanged

The long-awaited revision of the 1990 recommendations puts a cap on the amount an obese mother should gain and places more emphasis on exercise. Some doctors wanted to see a lot more. More than 60% of U.S. women of childbearing age are overweight or obese -- a significant increase from 20 years ago. And recent studies strongly suggest that either too much or too little nutrition in utero can increase a fetus' chance of becoming an overweight child and overweight adult.

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