infant mortality
noun/ˌɪnfənt mɔːˈtæləti/
/ˌɪnfənt mɔːrˈtæləti/
[uncountable]- the death of children under the age of one year
婴儿死亡（不满周岁） - the decline of infant mortality in the 20th century
20世纪婴儿死亡率下降 - the infant mortality rate
婴幼儿死亡率
- the decline of infant mortality in the 20th century