babyish

From baby +‎ -ish.

• (Received Pronunciation, General American) IPA^(key): /ˈbeɪbiɪʃ/

• Audio (US)

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babyish (comparative more babyish, superlative most babyish)

1. Like or suitable for a baby or a young child; childish
   • 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.

   For a young man, he has the most babyish voice I've heard.

   Synonyms: puerile, simple; see also Thesaurus:childish