So, my sons new pediatrician wanted to do blood food allergy testing. She confirmed Soy (which he has been off since he was 6 months old) and also found peanut and sesame seeds. She ordered him an Epi-Pen just in case.

Historically, he had a best friend that was peanut allergic so we didn't have peanuts in the house until we moved here about 4 months ago. He has since been eating peanut butter (on toast and sandwiches) a lot since then. We know basic substitutions (sunflower seed button). But I want to know what things we should be avoiding that may be surprising. For example, we know that tuna fish may contain soy protein and wouldn't have thought of that.

Any other tips and tricks are also appreciated.