The number of babies with a rare birth defect called gastroschisis almost doubled in more than 11 years, from 2.3 cases for every 10,000 live births in 1995 to 4.4 cases in 2005, a study showed. Women who gave birth in their early 20s had a 5.8% increased risk each year of having a child with the condition, while white, black and Hispanic women had about 4% to 6% increased risk each year. The findings appear in the journal Obstetrics & Gynecology.

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