J.R.
It sounds like you stopped cereal all together. How long have you been feeding him cereal? I would just stay with that and then try baby food every week or so and see what he thinks. Try the green beans or something. At 6 months I was usually feeding cereal at 8 am and 8 pm and baby food at noon and 4. Along with a bottle at each time. I he's hungry he'll eat it eventually.
Good luck,
J.