United States

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Location: United States
Topic: Low birthweight by maternal age
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Low birthweight by maternal age: United States, 2011-2013 Average

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• Maternal age is a risk factor for low birthweight, with higher low birthweight rates found among the youngest and oldest mothers in the U.S. 
• In the United States during 2011-2013 (average), low birthweight rates were highest for women ages 40 and older (11.6%) and under age 20 (9.5%) . 
• Of all infants born during 2011-2013 (average), 7.8% were to mothers under the age of 20, 51.6% were to mothers ages 20-29 years, 37.6% were to mothers ages 30-39 years, and 3.0% were to mothers ages 40 and older. 

Healthy people 2020

  • Low birthweight: reduce to no more than 7.8% of live births.


  • Low birthweight is less than 2500 grams (5 1/2 pounds).


  • National Center for Health Statistics, final natality data.
  • Retrieved October 09, 2015, from www.marchofdimes.org/peristats.