乳幼児
にゅうようじ nyuuyouji
Babies and preschool children
Korean says
영유아
written 嬰幼兒
Japanese乳幼児
Korean嬰幼兒
Korean has a word for the same thing, but writes it with different hanja, so it isn't counted as a twin.
- Example sentences and spaced, typed reviews are in the app.