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Overweight Moms More Apt to Have Large Babies, Study Says

WEDNESDAY, May 23 (HealthDay News) -- Being overweight or obese before and during pregnancy is the most reliable predictor of a woman's risk of giving birth to a large baby, which can increase the chances of cesarean section and other complications during delivery, a new study says.

The Canadian study of 472 women also found that elevated levels of blood glucose (sugar) and fats had little effect on the risk of having a big baby. A large baby is defined as a newborn whose weight is in the 90th percentile or above on Canadian fetal growth charts, or more than 8.8 pounds.

The findings support the importance of encouraging a healthy weight in young women as a way to reduce the risk of having a large baby. The results also suggest that more closely monitoring weight gain in overweight and obese women during pregnancy may be a good idea, concluded Dr. Ravi Retnakaran, of Mount Sinai Hospital in Toronto, and colleagues.

The study appeared online May 22 in CMAJ, the journal of the Canadian Medical Association.

Obstetricians typically focus on managing glucose levels in pregnant women with diabetes, to reduce their risk of having large babies. Recent studies have found a link between glucose levels in pregnant women even without gestational diabetes and the risk of having a larger baby, according to background information in the study.

Proposed new criteria from the International Association of Diabetes in Pregnancy Study Groups suggest a lower glucose level cutoff for diagnosing gestational diabetes to help identify women who may be at risk for having a large babies.

But the findings of this new study show that glucose levels are not a significant independent predictor of having a large baby, Dr. Edmond Ryan, of the University of Alberta, noted in an accompanying editorial.

Targeting weight issues may be a more efficient use of health care resources, he suggested.

More information

The U.S. National Institute of Child Health and Human Development has more about pregnancy and healthy weight.

-- Robert Preidt

SOURCE: CMAJ, news release, May 22, 2012

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