US Twin Birthrate Hits All-Time High

The country's twin birthrate hit 33.9 twins per 1,000 births in 2014, up from 33.7 twins per 1,000 births in 2013, according to the report from the Centers for Disease Control and Prevention. The "twinning rate" has nearly doubled since 1980, when the rate was 18.9 twins per 1,000 births, the researchers wrote in their report, published today (Dec. 23) by the CDC's National Center for Health Statistics. However, the birthrates of triplets and higher-order births declined in 2014, from 119.5 per