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NCHS Data Brief. 2009 Aug;(21):1-8.

Delayed childbearing: more women are having their first child later in life.

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Centers for Disease Control and Prevention, National Center for Health Statistics, Division of Vital Statistics, 3311 Toledo Road, Hyattsville, Maryland 20782, USA.


Of particular interest to both researchers and the public is the "average" age of women when they have a child, especially their first. Age at first birth influences the total number of births that a woman might have in her life, which impacts the size, composition, and future growth of the population. The age of the mother, both younger and older, plays a strong role in a wide range of birth outcomes (e.g., birthweight, multiple births, and birth defects), so it is critical to track the average age at which women have their first birth.

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