How is infant mortality rate defined?

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The yearly number of deaths of infants under one year old per 1,000 live birthsIndicates access to primary schooling, employment rights, and social welfareRepresents the average lifespan until the age of threeShows the availability of hospitals, childcare services, and the economic status of parents

Explanation

Infant mortality rate specifically measures the number of deaths among infants less than one year old per 1,000 live births annually. Other options describe different social or health indicators but do not define infant mortality.