aargh. ds who is 3.5 has been toilet trained for months. he will even wake thru the night to wee. but pooing, he won't do it in a potty, or a toilet (unless it's literally falling out of his backside). he won't do it in a pull up either. he holds it in, he can hold it for over 7 days easy... then just keeps getting skid marks on his undies and a pooey bum... no amount of bribing, rewarding etc makes a difference. seriously it's really getting me mad. I don't know what to do.