Need help getting my kitten to go poo!!!?

is he on the powdered KMR? that can constipate, while the liquid can cause diarrhea...its a never ending battle. when you are stimulating him, is there a bulge, like he has to go, but it is too hard and big? Is his belly gigantic? lol, bottle babies usually have big bellies. I would stimulate every 2 hours or so, and not too much, as he may get painful and raw. He is at a good age, where if the urge comes, and you are not around, he can produce the stool himself. so with going from momma's milk to formula, it can cause a back up,. I am sure he will have a BM anytime. Sounds like he is doing good otherwise!! so glad you rescued him!