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Location: Montana
Topic: Preterm by maternal age
Format: Bar Graph
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Preterm by maternal age: Montana, 2015-2017 Average

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• Maternal age is a risk factor for preterm birth, with higher preterm birth rates found among the youngest and oldest mothers in the U.S. 
• During 2015-2017 (average) in Montana, preterm birth rates were highest for women ages 40 and older (11.0%), followed by women under age 20 (9.3%), ages 30-39 (9.3%) and ages 20-29 (8.5%). 
• Of all infants born during 2014-2016 (average), 6.2% were to mothers under the age of 20, 54.1% were to mothers ages 20-29 years, 37.3% were to mothers ages 30-39 years, and 2.3% were to mothers ages 40 and older. 

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.


  • Preterm is less than 37 weeks of pregnancy.


  • National Center for Health Statistics, final natality data.
  • Retrieved January 19, 2020, from