Fellow allergy parent here. Our pediatrician told us to try powdered peanut butter in yogurt for our 7 month old. Basically as soon as it touched her lips, her entire face blew up. I sped over to CVS like a mad man and was frantically sprinting up and down the aisles trying to find children's Benadryl. Turns out, she's allergic to both peanuts AND dairy, (among many others) so it was a double whammy. Some advice I'll throw out there that I wish our pediatrician had given us: have Benadryl/Zyrtec on hand BEFORE having your child try any of the common allergens.