N.
I agree with the other posters about this issue. My 2 year old wasn't good with solids until well after his first birthday. We tried rice cereal at 4 months and he would just push it out with his tongue. We tried again and 5 months and 6 months with the same result. He eventually got it, and was on baby food long after when I thought most other kids were already eating table food, but now he can eat regular food just like any other 2 year old. My daughter, who is 7 now, was quite the opposite. She started rice cereal at 4 months and progressed very quickly from there with all sorts of solids. Each child is different and as long as they are getting the nutrition they need, I don't think it matters much where it comes from when they are still so young. Please don't worry. He's not "behind". He's probably just taking his time enjoying his infanthood for as long as he can. :-)