It appears that, in general, far less significance is placed on systematic food introductions for children. This seems to be a lost practice; some of my friends look at me like I am crazy when I say that I didn't give Allie peanut butter until she was three or that I just give Jack egg yolks (until he turns one). Perhaps there is a reason we have so many food allergies in children today. I can not remember even one friend growing up that was allergic to anything, however, this year in my first grade class I had two students with numerous food allergies, some of which are life threatening. I am not suggesting that anyone caused an allergy; I just think that we need to be more conservative in our food introductions.
WholesomeBabyFood.com has a great chart that shows when foods should be introduced by the babies age. This is a great list to print out and take with you to your pediatrician for discussion.