Health >> Infant Mortality >> Trends by Mother's Age

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From 2001 to 2010, the risk of infant mortality was lowest for babies born to mothers aged 25 to 39.

If a baby dies before his or her first birthday, that death is counted as an infant death. The number of infant deaths per 1,000 live births is known as the infant mortality rate, and is widely regarded as an indicator of the overall health of a community. 

For trend graphs, 3-year rolling averages were used to smooth out the large effects of year-to-year fluctuations.  King County’s 2010 infant mortality rate was 4.2 deaths per 1,000 live births; the average rate for 2006-2010 was 4.1 deaths per 1,000 live births.

  • Babies born to mothers aged 25-39 have consistently had lower infant mortality rates than those born to mothers of other ages.
  • From 2001 to 2010, infant mortality rates did not change for the children of mothers in any age group.