From Longman Dictionary of Contemporary Englishinfant mortality rateˌinfant morˈtality rate noun [countable] MBthe number of deaths of babies under one year old, expressed as the number out of every 1,000 babies born alive in a year
Examples from the Corpus
infant mortality rate• The post-war concern about population decline and the high infant mortality rate contributed to the introduction of the Midwives Act 1902.• The higher infant mortality rate among the working class was probably a major element throughout the nineteenth century in encouraging frequent pregnancies.• In the last great outbreak in 1911,32,000 infants died of diarrhoea and the infant mortality rate climbed to 130.• Their average life expectancy was 12 years less than that of whites, their infant mortality rate twice that of whites. 