I've been trying potty train my 3 1/2 year old son since he was 2 1/2. He's been doing really peeing since he made the choice to potty train but ever since he's been refusing to poop and I don't just mean in his underwear or pull up or in the potty I mean at all. He holds it and holds it till i have give him an enema to get him to go. I've talk to his doctor witch did no good at all. He just told me to load him up on fiber witch i've already been doing and the issue just seems to be getting worse. The pain has been making him aggressive and just all around in a horriable mood and i don't blame him for it but i know its not good for his health to be backed up all the time but i'm out of ideas. It doesn't matter what i try he's still refusing. Help. Any ideas or advice would be helpful.