K.H.
There is a medical term for people who don't/can't use the bathroom away from home. As adults this is usually manifested by people not pooping while on vacation or away from home, etc. I guess I wouldn't worry about it. His bladder at this age is perfectly capable, physiologically, of holding it until he gets home, so I would let him do that. Otherwise it gets into a fight over his body you can't win. If he was wetting himself I guess then I would worry, but since he's able to hold it, let him. When he is older if this becomes a problem, you can address it then. But at his age, I would just wait and see if he grows out of it. The bigger deal you make about it I think it may become a control battle that isn't worth it. Hope that helps!