Health United States 2020-2021

Infant death

The death of a live-born child before his or her first birthday. Age at death may be further classified as neonatal or postneonatal. Neonatal deaths are those that occur before the 28th day of life; postneonatal deaths are those that occur between 28 days and 364 days of life. (Also see Sources and Definitions, Rate: Death and related rates.)