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 Arizona in 2021, 97.0% of all live births were singleton births and 3.0% were multiple births.
Between 2011 and 2021, the multiple birth ratio in Arizona increased 5%.
Compared with singleton births (one baby), multiple births in Arizona were about 7 times as likely to be preterm in 2022.
Notes: Very low birthweight is less than 1500 grams (3 1/3 pounds). Multiple deliveries include twin, triplet and higher order deliveries.
Sources: National Center for Health Statistics, final natality data. Retrieved March 19, 2024, from www.marchofdimes.org/peristats.
In 2022, the very low birthweight rate among multiple deliveries in Arizona was 6.8%.
Of all live births in Arizona in 2021, 3.0% were multiples.