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Location: Illinois
Topic: Late preterm by maternal age
Format: Bar Graph
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Late preterm by maternal age: Illinois, 2016-2018 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 2016-2018 (average) in Illinois, late preterm birth rates were highest for women ages 40 and older (10.9%), followed by women under age 20 (7.6%), ages 30-39 (7.6%) and ages 20-29 (7.1%). 
• Of all infants born during 2014-2016 (average), 5.6% were to mothers under the age of 20, 46.4% were to mothers ages 20-29 years, 44.8% were to mothers ages 30-39 years, and 3.2% were to mothers ages 40 and older. 


  • Late preterm is between 34 and 36 weeks gestation.


  • National Center for Health Statistics, final natality data.
  • Retrieved May 30, 2020, from