noun
infant mortality rate
Technical demographic and public health term; refers to the number of deaths of infants under one year of age per 1,000 live births in a given year.
日本の乳児死亡率は世界でも低い水準にある。
Japan's infant mortality rate is among the lowest in the world.
乳児死亡
Improvement in the infant mortality rate is an important indicator of public health.