K.B.
HI J.,
I would recommend trying different things, fresh foods, not only are the good for him, good tasting and soft.
I peel and cut grapes in four.
pasta
cooked carrots
teething cookies
saltine crackers
watermelon
cantaloup
banana
pears
apples
Cut them small enough not to choke but big enough that he can grip them.
Something will awaken his interest and then go from there...
Cheerios are dry and hard so they may feel weird in his mouth.... My baby is very particular and wouldn't even take baby food but once I started giving him these foods he startes eating! ;)
Good luck!