The rate of twin births in the US has been increasing since 1980, reaching a high of 33.9 twin births per 1,000 births in 2014. The rate of higher order multiple births (triplets, quadruplets, etc.) rose sharply until the late 1990s and has trended downward since then. Increased rates of twin births have been associated with the use of fertility therapies, and the decrease in higher order multiple births have been linked to changes in these procedures. Multiple birth pregnancies and deliveries are higher risk for adverse outcomes for both mother and .
- Percent Multiple Births is the percentage of multiple births (twins, triplets, etc)
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