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Gestational age and birth weight characteristics by plurality: United States, 2013

Gestational age and birth weight characteristics by plurality: United States, 2013
Gestational age Singletons Twins Triplets Quadruplets Quintuplets and higher order multiples*
Number 3,623,963 120,291 3,136 114 36
Percent early preterm 2.14 19.96 62.90 85.09 100
Percent pretermΔ 8.47 60.87 98.50 95.61 100
Percent very low birth weight◊ 1.09 9.40 34.10 61.40 100
Percent low birth weight§ 6.67 55.48 95.29 95.61 100
* Quintuplets, sextuplets, and higher order multiple births are not differentiated in the national data set.
¶ Very preterm is less than 34 completed weeks of gestation.
Δ Preterm is less than 37 completed weeks of gestation.
◊ Very low birth weight is less than 1500 grams.
§ Low birth weight is less than 2500 grams.
Reproduced from: Martin JA, Hamilton BE, Osterman MJ, et al. Births: Final data for 2019. Natl Vital Stat Rep 2021; 70:1.
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