Adjective
babyish (comparative more babyish, superlative most babyish)
- Like or suitable for a baby or a young child; childish
- Synonyms: puerile, simple; see also Thesaurus:childish
For a young man, he has the most babyish voice I've heard.
1953, C. S. Lewis, chapter 9, in The Silver Chair, Collins, published 1998:As soon as the King and the rest of the hunting party had set off, she began making a tour of the whole castle and asking questions, but all in such an innocent, babyish way that no one could suspect her of any secret design.