Triplet births drop in US due to IVF changes: study

Fewer triplets, quadruplets and higher multiple sets of babies are being born from in-vitro fertilization in the United States due to more restrictive guidelines, researchers said Wednesday. The percentage of twin births in the United States nearly doubled over the past 40 years, going from 1.8 percent in 1971 to its peak of 3.5 percent in 2009, the study found. Triplet and higher multiple births reached a high point in 1998 and then dropped off sharply, declining almost 30 percent from 1998 to 2011, said the study. After that, the percentage of triplets or more born due to IVF fell from 48 percent of cases in 1998 to 32 percent in 2011.

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