Babies born too soon, even by a couple of weeks, face an increased risk of dying before their first birthday. Yet the proportion of early deliveries has been increasing at some hospitals, researchers have found.
Another recent study found that many moms, particularly first-timers, may take it upon themselves to induce labor.
The most comprehensive study was reported in May by scientists with the National Institutes of Health, the Food and Drug Administration and the March of Dimes. They analyzed birth certificate data from more than 46 million infants born between 1995 and 2006 and linked them to infant death certificates.