- Age specific death rates.

N.B:-
-from statistical point of view infant is who 1 year old.
- But from pediatric point of view infant is who 2 years old when early infancy is the first year of life and late infancy is the 2nd year of life.
- (1-4 years) child mortality rate from the end of the 1st year of life till the end of the 4th year of life.