My son is 4.5 years old. He has been potty trained for one year doing #1. However, for some reason he cannot seem to do #2. He doesn't understand the concept of "pushing the poop out" and I simply do not know how to explain it to him. He does go, but since he doesn't know how to push it out, the only time he goes is when he is so overfilled that he has no choice but to let it out and then, he tries to hold it in. I am totally at a loss on what to do. He has been sitting on the potty today for almost 8 hours trying to poop and I keep thinking that this can't be right. But I don't know what to do, when I take him off the potty and try to wipe him up, I can see the poop still coming out so I put him back on the potty to finish and it is now a recurrent cycle. Ever since I can remember he has had problems with constipation. I give him baby laxatives and raisins to loosen up his stools but they don't seem to do much good. He has to start Kindergarten soon and I am afraid he will be that one child who goes to Kindergarten in diapers. He has already been expelled from pre-kindergarten. What do I do or say to this child to get him to understand how to push the poop out? He is my third child, so I have done the potty training thing before but for some reason he just does not want to do it. I have talked to my doctor and their response is "he's just not ready." I find that hard to believe because he says that he wants to go on the potty but then after a few days in underwear and his first accident, he gets discouraged and reverts back to pull ups. Could this be a medical problem?