A.H.
I don't know what kind of sippy cup you tried but they do have these sippy cups that are transition cups so it makes it easier for the baby to go from the bottle to the cup. That worked with my son, but not until he was 1 year old. I would think that he still needs to stay on the bottle. Maybe lay off the solid food a little bit since he likes it so much and then maybe he will become a little more interested in his bottle again. I don't know if you've done this, but you could try adding cereals to his bottle. Maybe the bottle isn't holding him over anymore on its own. Put some oatmeal or rice cereal in it and maybe he will like it more. Of course, you will more than likely have to slit the nipple so he can get it out easier but maybe it will help. Good luck.