Some of my childish behaviors were symptoms or habits and I had to, over time, confront them in therapy and see if I wanted/needed that behavior still or wanted to act more socially acceptable, as an adult. I had one very childish behavior for over 50 years (one of the main reasons I wanted therapy) but it was based on the underlying anxiety and when therapy helped, the behavior finally wasn't needed and ceased being "useful" or what I wanted/needed.