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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).
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