The neonatal mortality rate counts deaths among children of which age?

1. The neonatal period runs from birth up to but not including 28 days of age. 2. Deaths in that window form the numerator of the neonatal mortality rate. 3. Deaths from 28 days up to one year form the postneonatal rate, and deaths under one year form the infant mortality rate. 4. The 42 day window belongs to the maternal mortality rate, which counts deaths within 42 days of the end of a pregnancy. _Source: CDC Principles of Epidemiology in Public Health Practice (3rd ed., US federal, public domain), Lesson 3 "Measures of Risk", section Neonatal mortality rate_