My son is the same way. He is four years old and can hold it up to eight hours. Most often he goes every four hours or so, but sometimes he waits longer. He never has an accident and he goes when he truly feels he needs to. I always have to coax him to go before bed, just for my own peace of mind I make him go before bed. He has not had any medical problems, but now after reading the other responses, maybe I will consult his physician. He is a very healthy, active little boy. Has anyone had the same thing and can offer up advice as to what a physican actually said? I think some of the responses sound harsh. Best advice: ask the doctor, and I think I will do the same.