almost 9

I have an 8 year old boy that will be 9 in January 08 and he still poops in his underwears. He has no problem going to the restroom for peeping but when it comes to pooping he just doesn't go we tried everything good guys or just plan bad ( when we take stuff away because he poops in his underpants & we make him wash his own). But also we give him stuff to go we have books for him magazines gameboy (everything) and we just can't make him poop in the toilet he holds it in. I have taken him to the doctor and they tell me he doesn't have anything and I have take him to a  childrens psychiatrist and he tell me his find his just a lil slow but his now in 3th grade in school and its getting hard just because kids are making fun of him and its heart breaking. what can I do? I have a 7 year old daughter too and she has no problem at all. his a very happy kid I jsut don't know what to do

[RockRose]

search google for encopresis.

Then,  give him extra fiber or metamucil.