Find out if it is his teacher. My son told me that the teacher tells them to only raiser their hand to go potty if it is an emergency. Then he told me that when he raises his hand the teacher tells him no. Once I picked him up after school and he raced into the bathroom and I told him not to hold it for so long because he will develop bladder problems and he told me the teacher wouldn't let him go-it is so strange. I understand that when one child goes, it starts a trickle down effect (not literally-smile)but sometimes when they have to go,they really have to go. So now my son won't even ask the teacher to go. Yikes!