United States

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Location: United States
Topic: Distribution of gestational age categories
Format: Pie Graph
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Distribution of gestational age categories: United States, 2014

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• In the United States in 2014, 1.6% of live births were very preterm, 8.0% were moderately preterm and 90.4% were not preterm. 
• In 2014, 1 in 10 babies (9.6% of live births) was born preterm in the United States. 

March of Dimes 2020 Goal

  • Reduce preterm births to no more than 8.1% of live births.
  • For more information, see here.

Healthy people 2020

  • Preterm births: reduce to no more than 11.4% of live births.
  • Very preterm births: reduce to no more than 1.8% of live births.


  • Not preterm is greater than or equal to 37 weeks gestation.
  • Preterm is less than 37 completed weeks gestation.
  • Very preterm is less than 32 completed weeks gestation.
  • Moderately preterm is 32-36 completed weeks of gestation.


  • National Center for Health Statistics, final natality data.
  • Retrieved October 26, 2016, from www.marchofdimes.org/peristats.