Twin Births Doubled in Three Decades

    Image #: 3610229    Identical twin sisters Danielle (L) and Alison Herman from Stow, OH, embrace with their first place medals for 11 and 12 year olds in a look-alike contest during the final day of the 32nd annual Twins Days Festival in Twinsburg, Ohio August 5, 2007. The twins, born on January 26, 1996, are participating in the festival for their 11th time. The self-proclaimed "largest annual gathering of twins in the world" attracted almost 2,000 sets of identical and non-identical twins this year, who participated in look-alike contests, talent competitions and other entertainment.     REUTERS/Jason Reed /Landov

    Jason Reed, Reuters / Landov

    The number of twins born in the United States has doubled over the last three decades, according to the Centers for Disease Control and Prevention. The huge increase is largely the result of new fertility treatments. "We seem to be making improvements, refinements to fertility-enhancing therapies, so that could then result in a lowering of the increase of the pace in twin and other multiple births,” said the author of the CDC study. More than 137,000 twins were born in the U.S. in 2009, accounting for one in every 30 babies.

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