G.B.
Really babies can do nothing except formula for the first year. It is complete nutrition. I know we all start them on solids before that though. They would be totally shocked when the formula is gone and they suddenly have to start chewing and swallowing.
I think he is just not ready to eat solids. He is perfectly normal. Just keep trying occasionally and let him tell you when he's ready. I would think about 10 months he'd be ready to eat baby food 2-3 times per day.