babyish
From Longman Dictionary of Contemporary EnglishRelated topics: Babies, Childrenbabyishba‧by‧ish /ˈbeɪbi-ɪʃ/ adjective DHBSSClike a baby, or suitable for a baby The games were a little babyish for nine-year-olds.Examples from the Corpusbabyish• I didn't notice it myself but looking at the people at school you think how babyish.• These lent a world-weary cast to a face that might otherwise have been babyish.• They were all turning 4 and they saw drooling as a babyish behavior, something they were proud to be leaving behind.