Abstract
Current guidelines recommend a gestational weight gain of 35-45 pounds for a twin pregnancy, but actual levels of weight gain during pregnancy among US women delivering twins are currently unknown. We assessed gestational weight gain among 6345 US women who delivered twins from 2001 to 2006, using data collected from 28 states and New York City participating in a population-based surveillance system (PRAMS). Approximately one-third of mothers who delivered twins gained 45 pounds or more during pregnancy. Weight gains were higher among women with lower prepregnancy body mass indexes. The percentage of twins with a normal birthweight increased with increasing gestational weight gains, except among obese women with the highest level of gain (>/= 65 pounds). A notable percentage of US women who deliver twins gain above the current guidelines. The benefits of high gestational weight gain during twin pregnancies need to be balanced against an increased risk of maternal weight retention and later obesity.
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