My 8 year old son will only poop in a potty not a toilet. When we go out or when he’s at school he wears diapers because he will just go in his pants. If we take the potty away he’ll go in his pants. If we keep him naked he’ll just go on the floor. The school year is about to start. We took the potty away for the entire summer and he just went in his pants. The school is threatening not to let him come back. Please help.