I know this is an old thread - but I still want to respond. I agree with the pp's who say let your child's readiness determine when you start solids and be judicious with what you feed them. I disagree with the comparison to it being like letting them play with a steak knife.
My son did not want, nor did we start, solids until past 12 months. I wish he wanted to start sooner (it was a lot of pressure on me as he was EBF), but he just didn't want to. He never touched puree - ever. While he was a great nurser, he was and still is a very picky eater. My daughter on the other hand, who is now 5 months, loves solids. She has sweet potato, winter squash and pear. We started out with only sweet potato at 4 months - and she really loved it. I would not stress too much about it. I would just stay away from grains, as someone else suggested before. Heck - my friend's mom told me today that 39 years ago they wanted you to start rice cereal at a few days old. The most current recommendation is to start between 4 and 6 months (i know i was just at the pediatrician for my DD's 4 month appt). Recommendations change all the time - so don't sweat it. You know your baby best.