CBS News
The twin birth rate hit at an all-time high last year in the United States while the rate for triplets, quadruplets, and higher was the lowest in two decades. Of the nearly 4 million babies born last year, more than 135,000 were twins. That is about 1
U.S. twin birth rate hits record highWGNO
Birth rate for twins hits record high in the U.S.WQAD.com
Rate of twin births at historic high, report saysWLS-TV

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Source: HEALTH