Washington: Women conceiving at older ages, thanks to the availability of fertility treatments, has spurred the birth of twins.In 2009, one in every 30 babies born in the US was a twin compared with one in every 53 in 1980, according to a new finding by Michigan State University researchers."Prior to 1980, the incidence of US twin births was stable at about two percent of all births, but it has risen dramatically in the past three decades," said Barbara Luke from Michigan state.She noted that twin births increased for women of all ages, with the largest increases among women aged 30 and older. "Older maternal age accounts for about one-third of the rise, and two-thirds is due to the increased use of fertility treatments," added Luke.
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