| ||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 2008-2010 (average) in St Louis city, late preterm birth rates were highest for women under age 20 (13.0%), followed by women ages 40 and older (12.7%), ages 20-29 (11.5%) and ages 30-39 (10.3%). |
| ||Of all infants born during 2008-2010 (average), 14.6% were to mothers under the age of 20, 55.6% were to mothers ages 20-29 years, 28.1% were to mothers ages 30-39 years, and 1.7% were to mothers ages 40 and older. |
National Center for Health Statistics, final natality data.
Retrieved May 21, 2013, from www.marchofdimes.com/peristats.