The rate of twin births apparently peaked in 2014 and has fallen 4% since. Last year, the rate hit its lowest point in a decade — and doctors say that's a good thing.
The CDC did not release figures on triplets or other multiple births, but said data suggests it’s trending the same way.
Why the decline? Experts can’t say for sure. But Joyce Martin, the report’s lead author, noted the decrease occurred only in white women and in women 30 or older. Those women are the biggest customers of expensive in vitro fertilization treatments, which are involved in roughly 15 percent of multiple births. And there’s been a shift in how that technique is done.
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