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Reproductive and Birth Outcomes

Tracking Reproductive and Birth Outcomes

The Tracking Network obtains data for reproductive and birth outcomes from CDC's National Center for Health Statistics National Vital Statistics System and the U.S. Census Bureau. Vital statistics data are information about human life such as births and deaths.

Providing these data through the Tracking Network can improve surveillance methods by creating indicators that can be linked to environmental exposure or hazard data that are not being collected by existing surveillance systems.

The Tracking Network collects and displays data on the following reproductive and birth outcomes:

  • Premature Births: When a baby is born before the 37th completed week of pregnancy. Babies born before the 32nd completed week of pregnancy are considered very preterm.
  • Low Birthweight: Birthweight is the weight of the newborn measured immediately after birth. Birthweight of less than 5.5 pounds, or 2,500 grams, is considered low birth weight. Birthweight of less than 3.3 pounds, or 1,500 grams, is considered very low birthweight.
  • Infant, Neonatal, Post-Neonatal, and Perinatal Mortality
    • Infant mortality: When an infant dies younger than 1 year of age.
    • Neonatal mortality: When an infant dies younger than 28 days of age.
    • Post-Neonatal mortality: When an infant dies from 28 days of age to under 1 year old of age.
    • Perinatal mortality: Death after 28 weeks of gestation plus deaths of infants younger than 7 days of age.
  • Fertility:
    • Total fertility rate: The estimated number of births that a hypothetical group of 1,000 women would have over their lifetimes.
  • Sex Ratio: The number of babies born male compared to the number of babies born female.

Learn more about the exposure and risk factors for these reproductive and birth outcomes.

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