Researchers report women who stop taking contraceptives closest to becoming pregnant tend to have larger babies, possibly leading to a preventive drug for women at risk of delivering underweight babies, according to a study. Researchers found the larger babies delivered by women who had taken the pill may be the result of third-trimester increases in progesterone levels, an indication a hormonal treatment could prevent underweight infants, though several experts cautioned against over-interpreting the results.

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