different between youthful vs babyish

English

From youth +? -ful.

youthful (comparative more youthful, superlative most youthful)

Young or seeming young.
Synonyms: lively, sprightly, spry, young; see also Thesaurus:young, Thesaurus:active
Characteristic of young people.

baby +? -ish

babyish (comparative more babyish, superlative most babyish)

Like a baby or a young child; childish
- 1953, C. S. Lewis, The Silver Chair, Collins, 1998, Chapter 9,
  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

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