Preterm births in the United States

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Definitions: Babies born with a gestational age of less than 37 completed weeks.

Birth certificates that did not report gestational age were not included in this tabulation. Puerto Rico and Virgin Islands are not included in the U.S. average.

Data Source: Population Reference Bureau analysis of 2007 to 2018 data from the National Center for Health Statistics (NCHS). Child Trends analysis of 1990-2006 Natality MicroData files from Centers for Disease Control and Prevention, National Center for Health Statistics.

Footnotes: Updated April 2020.
Data are provided for the 50 most populous cities according to the most recent Census counts. Cities for which data is collected may change over time.