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 Iowa in 2021, 96.4% of all live births were singleton births and 3.6% were multiple births.
Between 2011 and 2021, the multiple birth ratio in Iowa increased more than 5%.
Compared with singleton births (one baby), multiple births in Iowa were about 7 times as likely to be preterm in 2022.
Notes: Low birthweight is less than 2500 grams (5 1/2 pounds).
Sources: National Center for Health Statistics, final natality data. Retrieved March 19, 2024, from www.marchofdimes.org/peristats.
In 2022, the low birthweight rate among singletons (one baby) in Iowa was 5.5%.
While the overall low birthweight rate in Iowa increased more than 7% between 2012 and 2022, the percentage of singleton infants born low birthweight increased more than 12%.