Really need help my 4y.o. son is refusing to come out of nappies, I've tried everything from pull ups to pants, reward chart, treats etc I've even gone as far as putting the potty in his room incase it's a shyness thing but he refuses to come out of nappies. He screams if I go to put pants/pull ups on him. I don't know what to do he is meant to start school in September but he won't use toilet/potty. Please help! 