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QuickStats: Distribution of Births, by Gestational Age --- United States, 1990 and 2005

The distribution of births by gestational age changed between 1990 and 2005. The percentage of preterm births (<37 completed weeks of gestation) increased 20%, from 10.6% to 12.7%; the percentage of births at 37--39 weeks of gestation also increased, from 41.4% to 53.5%, a 29% increase. In contrast, the percentage of infants born at 40 weeks and especially 41 weeks of gestation declined (15% and 43%, respectively).

SOURCE: National Vital Statistics System. Births: preliminary data for 2005. Available at http://www.cdc.gov/nchs/products/pubs/pubd/hestats/prelimbirths05/prelimbirths05.htm.

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Date last reviewed: 4/12/2007

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