Since 1980, the twin birth rate rose 76%. In 1980, one in every 53 babies born in the U.S. was a twin and in 2009, it had risen to one in 30. The largest increase occurred among non-Hispanic white mothers.
Interestingly enough, about one-third of the increase in twin births is due to the increase of older women having children. It is more likely for women in their 30s and 40s to naturally have twins than their younger counterparts. However, nearly two-thirds of the increase can be explained by the rise of infertility treatment.
Overall, twin births only make about 3% of all births. There are also health risks to keep in mind such as early birth, low weight, and longer hospitalization related to multiple births.
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