My 11 month old has reacted to tree-nuts in my breastmilk, and while we have not had him tested yet, I am dreading a life of no-nuts for him. We are a nut free household, just to be sure he doesn't accidently eat something. But my biggest frustration recently was my in-laws. We left our children with them for a morning. When we got back they casually mentioned that that was the rest of my son's peanut butter sandwhich! WHAT??!! I know that he hasn't reacted to me eating peanuts, but he was only 10 months, and we told them we were being super careful about introducing any new food to them. Especially high alergens. And you would think someone with a shellfish allergy would be more careful! I was mad. And that was just one of the new foods he got introduced to without my consent (or knowledge) on that vacation. The good news is that he didn't react to the peanut butter. But he is getting tested before we try a tree-nut.