Summary: Number of births, birth and parent characteristics

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This database report counts of live births occurring within the United States by state, county, child's gender and weight, mother's race, mother's age, mother's education, gestation period, and prenatal care.  Births to nonresidents of the United States are excluded from all tabulations by place of residence. Data are derived from birth certificates. Counties with fewer than 100,000 persons are combined together under the label "Unidentified Counties."  For confidentiality reasons, totals of 1-5 in counties are suppressed.  Data are not available for all counties.  Birth rates and fertility rates are not available from 1995-2002.  


Changes in demographic category classifications in 2010 make some birth and fertility rates comparisions inconsistent with earlier years.  Users should exercise caution when comparing time series data across races and/or ethnicities because of this change. 


Note that some states, including California, ceased reporting the mother's age and marital status, e.g., Mothers 25-29, Unmarried, Mothers 25-29, Married, etc. in 2017.  Instead, the states report the mother's age and unknown marital status or the mother's age and not available marital status.  


See additional documentation from the CDC for changes in some variables over time. 

Geographic Coverage: U.S., States, Counties

Periodicity: Annually

Series Begins/Ends: 1995 - 2018

Data Source: National Center for Health Statistics (NCHS) at the Centers for Disease Control and Prevention (CDC)

Updated:  Dec. 27, 2019 Estimated next update: Dec. 21, 2020

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