Death occurring to an infant aged 28 days to 364 days.
Death occurring to an infant aged 28 days to less than 1 year.
A death of an infant 28 days or more but under one year of age.
Death of an infant at least 28 days of age but less than one year of age.
Death between 28 days and one year of birth of an infant surviving the neonatal period.
Any death of a liveborn infant at least 28 days of age but under one year of age.