Longman Dictionary of Contemporary English
infant mortality rate
noun
EXAMPLES FROM CORPUS
▪ In the last great outbreak in 1911, 32,000 infants died of diarrhoea and the infant mortality rate climbed to 130.
▪ The higher infant mortality rate among the working class was probably a major element throughout the nineteenth century in encouraging frequent pregnancies.
▪ The post-war concern about population decline and the high infant mortality rate contributed to the introduction of the Midwives Act 1902.
▪ Their average life expectancy was 12 years less than that of whites, their infant mortality rate twice that of whites.
Wiktionary
infant mortality rate
n. (context geography English) The total number of deaths in a year among infants under one year of age for every 1,000 live births in a society.
WordNet
infant mortality rate
n. the death rate during the first year of life [syn: infant deathrate, infant mortality]