I had a VERY bad experience with my son when he was 14 months old! He had an extereme allergic reaction, within 5 seconds of eating the peanut butter that I gave him for the same reason you mentioned (this was 11 years ago, when peanut allegries were hardly spoken) he broke out in hives all over his face, his eyes were swollen shut, his lips and tongue blew up like a balloon, and he started to have a hard time breathing. Thank God I had liquid Benadryl in the house, which I gave him immediatelyand called the doctor! (Who did not send me to the E.R. for some reason, and I like a jerk listened!) I also do not have any food allegries nor does anyone on boths side of the family. But looking back their were some signs that I or at least the ped., should have noticed. The one time I ate peanut butter when I was pregnant, was the one time I threw up. My son also had very bad eczema all over his legs, arms, and hands which were probably reactions to the peanut butter and sunflower seeds I was eating while I was breastfeeding him, (he's also very allergic to sunflower seeds, the highest his allergist has ever seen) Oh and looking back at his baby pictures, his eye lids were always so red and he had "allergy shiners" under his eyes. Needless to say I stopped going to the ped. after he missed a bunch of allergy things with my son for the next 2 year, funny the ped. was in the NJ Magazine for being a top doc. LOL. I would suggest talking to your ped., and think about giving him the peanut butter in the doctors waiting room. It is easy and a great source of protein, it would be a shame to miss out on it, if he can have it! But, it was scary, I would hate to see another mom go through it!