I don't really think this is an issue yet. He's still very young, and all kids develop at different rates. As long as he's nursing/taking a bottle and eating baby food, he'll thrive! If you're feeling that knot in your stomach, really worried that something may be wrong, then talk to your pediatrician! He/she can take a look, and see if there's a medical issue.
But if he's nursing and loving the baby food, I bet he's just not ready for big kid food yet. Keep offering, in a very relaxed way. (No stuffing it in there!) Act like you couldn't care less. (He may be too smart for his own good, and trying to get your goat. Mine does that!) Eventually, he'll pick something he likes and go to town.
It'll probably be something weird, like a pickle or kiwi! :)
PS I think that mama had a good idea- about changing the location. I can get my son to eat ANYTHING, if he's in my lap or if it's on the floor...sigh...