I'm not sure if you received any suggestions regarding this, I am not a doctor (nor in the field), but I have three girls, of which two have a severe peanut allergy (and I avoid nuts altogether with all three). My discovery occurred similiarly as yours did. My oldest was 18 months old and after two or three bites, she began itching, hiving, and the vomiting started on the way to the emergency room. This is situation is not to be taken lightly. I could have lost her (after two or three bites). I grew out of a peanut allergy and I hope they will as well. The major culprit is tree-nut allergens. Unfortunately, many pediatricians do not like to perform allergy tests on children that young, but they will with certain food allergies. Better safe than sorry! And...from now on...you need to read all labels. Last year, my same daughter ate 1/4 of a glazed donut that was produced on a peanut belt and I had to call the ambulance. Usually, if the child has a reaction to a food item, it may or not be severe, but the more you expose them to that allergen, the worse their bodies will react. In these cases, you could be increasing the severity of the bodies reaction to the allergen. In other words, the more you expose, the worse it can eventually get. I don't know why, but this peanut allergy issue is affecting more people than ever before! BE SAFE...ELIMINATE TREE-NUTS!