I had 3 sons. I stopped taking them with me at about 2 but helped bath If It doesn’t have to do with Anime video games or food then I don’t care shirt. Taught them early to bath their own privates. The boys would go in with their dad until about 4 then we just naturally helped with hair and taught them to do it themselves. I was just close to supervise outside the door. We only had showers with no bathtubs. I never bathed with mine! I want to teach him from day one about personal space and privacy. It’s a personal choice but I would say before they start to notice differences between your body and theirs.