# Teen mothers ages 15 to 19

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**Definitions:**
Teenagers age 15 through 19 who are mothers. Rate is per 1,000 females between age 15 and 19.

Teen mother estimates are derived from vital statistics on births to
women who were ages 15-19 at the point in time to which each estimate
refers: 2005, 2004, 2003, 2002, 2001, or 2000. In order to avoid
counting the same mother more than once, only first and not higher-order
births were included.

First births to girls ages 14 or younger were excluded from certain
estimates because some or all of these girls were not yet 15 years old
in a particular year for which we estimated the number of teen mothers.
Specifically, we excluded the following first births to girls ages 14
and younger: those occurring in 1999-2002 from the 2003 estimate, those
occurring in 1998-2002 from the 2002 estimate, those occurring in
1997-2001 from the 2001 estimate, and those occurring in 1996-2000 from
the 2000 estimate. Additionally, we excluded the following first births
to girls ages 14 and younger because some or all of these girls were
older than 19 in a particular year for which we estimated the number of
teen mothers: those occurring in years prior to 1998 from the 2003
estimate, those occurring in years prior to 1997 from the 2002 estimate,
those occurring in years prior to 1996 from the 2001 estimate, and
those occurring in years prior to 1995 from the 2000 estimate.

Because in any given year the number of teen mothers includes mothers
who gave birth in the current year and those who gave birth in prior
years, the number of 15 to-year-old mothers at one point in time is
substantially greater than the number of births occurring to teens in
that year. Because state-level estimates reflect the mother's state of
residence at the time of the birth rather than the mother's current
state of residence, the state-level statistics do not reflect interstate
migration that may have taken place since the time of the birth.
However, this is likely to have a small effect on the numbers.

**Data Source:**
Child Trends analysis of 1990-2005 Natality Data Set CD Series 21, numbers 2-9, 11-12, 14-16 (SETS versions), and 16H and 17Ha (ASCII version), National Center for Health Statistics.

**Footnotes:**
Updated September 2008.

Birth Data for the city of Miami and Jacksonville is not available for 2004 and 2005. The National Center for Health Statistics is investigating a possible data error that might have occurred. More information will be available soon.

Data are provided for the 50 most populous cities according to the most
recent Census counts. Cities for which data is collected may change
over time.