Pregnancy outcomes can vary for singleton and multiple births. Multiple births include twins, triplets and higher order births, and outcomes can vary among these groups as well.
Last updated:
January 2022
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Singletons & Multiples
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In the United States in 2021, 96.8% of all live births were singleton births and 3.2% were multiple births.
Between 2011 and 2021, the multiple birth ratio in the United States declined more than 7%.
Compared with singleton births (one baby), multiple births in the United States were about 7 times as likely to be preterm in 2022.
Sources: National Center for Health Statistics, final natality data. Retrieved March 19, 2024, from www.marchofdimes.org/peristats.
In the United States in 2021, 96.8% of all live births were singleton births and 3.2% were multiple births.
Between 2011 and 2021, the percent of live births that were singleton in the United States increased slightly.