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High prepregnancy body-mass index--a maternal-fetal risk factor.

Obesity is one of the most common nutritional problems complicating pregnancy in developed countries. Maternal obesity has been defined in various ways, including a body weight above 80 to 114 kg (175 to 250 lb), a weight 50 to 300 percent more than ideal prepregnancy weight for height, and a maternal body-mass index (the weight in kilograms divided by the square of the height in meters) from 26 to 29 (for overweight) or above 29 (for obesity). There is general agreement that maternal obesity is associated with an increased risk of medical and puerperal complications, including hypertension, preeclampsia, gestational diabetes . . .