Doctors urge more exercise for pregnant women

"About 45 percent of current mothers-to-be begin their pregnancy in an overweight or obese state, vs. 24 percent in 1983. In addition, nearly half of pregnant women now gain more weight in nine months than the amounts recommended by the Institute of Medicine. Those guidelines are ordered by body mass index of the woman -- normal, overweight or obese -- and stand at 25 to 35 pounds, 15 to 25 pounds, and 11 to 20 pounds."