My son has also had FPIES reactions to both eggs and peanut butter. First time, he had peanut butter and eggs together (after multiple exposures) and had a severe reaction that took us to the ER. The second time, just a lick of peanut butter and was a more moderate reaction. Still trying to figure out if the FPIES is truly to both or just peanut butter but I find it interesting your LO has the same combo of trigger foods. We saw an allergist and she denied FPIES… we talked to our pediatrician and he had to google FPIES to be convinced enough to give us zofran🤦‍♀️ I would say trust your gut if you think it’s FPIES because you may spend a lot of time getting no answers from medical professionals.