After more than three decades of consistent increases, the number of American families welcoming twins is decreasing, and the twin birth rate in the U.S. is now at the lowest point in a decade, the Centers for Disease Control and Prevention reported Thursday.
The most marked decline in twin births today is among mothers aged 30 or older. The rate fell by 10 percent for women aged 30-34, 12 percent for women aged 35-39 and 23 percent for women aged 40 and over.
Twin births steadily increased each year beginning in 1980, and that pattern of growth persisted for three decades. The twin birth rate in the U.S. surged 79 percent between 1980 and 2014, driven largely by older white moms undergoing fertility treatments.
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