He just will not. I really have tried everything.
I've spoken to the school and they're OK with it, but my patience is stretched to the limit. (I'm very careful to appear calm).
He won't say why. He just says he doesn't like it. He never wets, just holds and holds until I put a nappy on. This is for wees as well as poos. If I withdraw nappies completely he shouts and cries and screams and eventually wets himself.