Version May 2024
| Singletons | Twins | Triplets | |
| Number of births | 3.6 million | 120,291 | 3136 |
| Average gestational age | 38.51 | 35.04 | 31.66 |
| Average birthweight | 3286 | 2345 | 1681 |
| Percent 34 weeks | 2.1 | 19.96 | 62.9 |
| Percent 37 weeks | 8.47 | 60.87 | 98.5 |
| Percent very low birth weight (<1500 grams) | 1.09 | 9.40 | 34.10 |
| Percent low birth weight (<2500 grams) | 6.67 | 55.48 | 95.29 |
Adapted from: Martin JA, Hamilton BE, Osterman MJK, et al. Births: Final data for 2019. Natl Vital Stat Rep March 2021.
United States Department of Health and Human Services (US DHHS), Centers for Disease Control and Prevention (CDC), National Center for Health Statistics (NCHS), Division of Vital Statistics, Natality public-use data 2016-2019, on CDC WONDER Online Database, October 2020. Accessed at http://wonder.cdc.gov/natality-expanded-current.html on May 27, 2021 3:33:16 PM
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