Death of an individual less than one year of age. Infant deaths are further classified as neonatal deaths and postneonatal deaths. (See also neonatal death and postneonatal death.)

A death of a live-born infant under one year of age.

Death of an infant less than 1 year old. Neonatal death is the death of an infant less than 28 days after birth; postneonatal death is the death of an infant between 28 days and 1 year after birth.

Death of an infant within a year of birth.

Any death at any time from birth up to, but not including, the first year of age(364 days, 23 hours, 59 minutes from the moment of birth).