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Health & Pregnancy

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Heart Defects, Mom's Weight May Be Linked

Being Overweight or Obese Before Pregnancy May Be Tied to Increased Risk of Congenital Heart Defects
WebMD Health News
Reviewed by Louise Chang, MD

Oct. 1, 2009 -- Women who are overweight or obese before getting pregnant may be more likely than leaner women to have babies born with heart defects, a new study shows.

The study, published in the advance online edition of the American Journal of Obstetrics and Gynecology, included the mothers of 6,440 babies born with congenital heart defects between 1997 and 2004.

In telephone interviews, the mothers reported their pre-pregnancy height, weight, and various lifestyle and medical factors.

For comparison, the researchers asked the same questions of 5,673 women who had babies during the same time period without heart defects.

Compared to women with a normal BMI (body mass index), women who were overweight but not obese before pregnancy were 16% more likely to have a baby born with a heart defect.

By the same comparison, women who were moderately obese before pregnancy (BMI of 30-34.9) were 15% more likely to have a baby born with heart defects.

Women who were severely obese before pregnancy (BMI greater than 35) were 31% more likely to have a baby born with a heart defect.

"Congenital heart defects are the most common types of birth defect, and among all birth defects, they are a leading cause of illness, death, and medical expenditures," Edwin Trevathan, MD, MPH, director of the CDC's National Center on Birth Defects and Disabilities, says in a news release.

"Women who are obese and who are planning a pregnancy could benefit by working with their physicians to achieve a healthy weight before pregnancy," Trevathan says.

The study doesn't prove that the women's extra weight caused birth defects in their babies. Observational studies like this one can show associations, but they don't prove cause and effect.

Also, the women reported their height and weight; they weren't measured. Self reports of weight aren't always accurate, and that could have affected the results.

However, the researchers considered factors including maternal age, and they excluded mothers with type 1 or type 2 diabetes, because diabetes is a strong risk factor for heart defects.

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