| ||Of all live births in the United States during 2011-2013 (average), 7.8% were to women under the age of 20, 51.6% were to women ages 20-29, 37.6% were to women ages 30-39, and 3.0% were to women ages 40 and older. |
| ||Babies delivered to younger and older women are often at increased risk of poor birth outcomes, including prematurity, low birthweight and infant mortality. |
National Center for Health Statistics, final natality data.
Retrieved September 24, 2016, from www.marchofdimes.org/peristats.