We started solids with Tyler at 6 mo, and it took several weeks before he got even remotely interested. He'd eat maybe 1 tsp at each meal and wouldn't open his mouth. We kept trying a new food every few days, and finally one day, he opened his mouth and got interested (it was peas, of all things!). Sometimes it just takes some babies longer than others. I wouldn't try switching things around, since breastmilk should still be his main source of nutrition and he has plenty of time to get the hang of solids. Try your best to be patient and have fun with it, and he'll come around when he's ready!