I don't want to freak you out by ANY means, but I do want to mention this just to put it out there. My sister's husband, years ago, was, unbeknownst to her, abusing her son in horrible ways. At that time, he was 5, and he suddenly was going in his pants constantly. Noone could figure out why. Of course this is the worst case scenerio, but it does go to show that often there's an "issue" with a child, if it's not caused by a urinary tract infection or some medical issue. I would dig around and scope out his interactions with people he's with, just to be on the safe side. See if he's reluctant to go with anyone in particular, or to a certain place... just to ease my mind, I'd be investigating his relationships with everyone around him, just to err on the side of caution. Again, not to say this is the case, but god forbid, you want to be sure.... (don't like to be the bearer of bad news per se, but better to be safe....) It could, however, just be a simple thing that's bothering him that he's just not dealing with, or doesn't know how to deal with, that's sending him into this behaviour. Keep digging, mom. Good luck.