Triplet births decline as IVF practice evolves

Number of U.S. pregnancies resulting in three or more babies has gone down since 1998

By Nathan Seppa, 14:26 PM December 4, 2013

The likelihood of U.S. women giving birth to three or more babies from a single pregnancy has decreased in the last 15 years after rising in previous decades. The reversal coincides with changes in how in vitro fertilization, or IVF, is done, researchers report in the Dec. 5 New England Journal of Medicine.

In IVF, doctors implant embryos — often more than one — into a woman’s uterus. In the late 1990s, three-fourths of IVF procedures in the United States transferred three or more embryos at o...

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