K.,
It is so frustrating when we can't help our children because they have to do it in their time and in their way. My son used to hold it, but after a year he finally does go in the toliet on his own.
We had incentive charts, immediate reward toys, immediate visits to Target for Thomas trains, candy, etc...it worked when he was ready to go and it didn't work when he wasn't ready. I wanted to lose it. He was getting into a terrible cycle.
We finally said enough. When he is ready, he will do it. We did however tell him he couldn't go to the park or school if he had to go and was holding it. WE did not make a big deal out of it or use anything as a punishment. We just shared that his teacher needed him to go on his own and that there was no bathroom at the park. We also increased his intake of oat fiber (we purchased at a health food store) and water. This combo really helped him go. He found it difficult to hold it and he has been successful and healthy ever since. It did take forever though to get him to go on the toliet. It may seriously be a maturity issue.