DS is 6 and potty trained easily when he was 2.5. He has never had a lot of accidents. In the last few months he has been wetting himself once a month or so. It's always when he is outside, and playing. I have not made a big deal of it, and just helped him change his clothes. Today he was on a school trip, and wet himself just before he came home. Would you be worried about this or is it just one of those things that happens occasionally?