Infant mortality rate

Infant mortality refers to deaths of young children, typically those less than one year of age. It is measured by the infant mortality rate (IMR), which is the number of deaths of children under one year of age per 1000 live births.

https://en.wikipedia.org/wiki/Infant_mortality

• Perinatal mortality only includes deaths between the foetal viability (22 weeks gestation) and the end of the 7th day after delivery.
• Neonatal mortality only includes deaths in the first 28 days of life.
• Postneonatal mortality only includes deaths after 28 days of life but before one year.
• Child mortality includes deaths within the first five years after birth.