Change Indicator

Preterm births in United States

  • Detailed
  • Sort / Rank

Definition and Source



Babies born with a gestational age of less than 37 completed weeks. Birth certificates that did not report gestational age are not included in this tabulation. 

Data Source

PRB analysis of data from the Centers for Disease Control and Prevention, National Center for Health Statistics microdata files.


S - Estimates suppressed when NCHS reporting standards not met.

N.A. - Data not available.

Data are provided for the 50 most populous cities according to the most recent Census counts. Cities for which data are collected may change over time. 

Last Updated

April 2024