I am so sorry you are going through this! We had similar frustrations with our eldest and first fpies diagnosis. I agree with others that there aren’t any “safe” foods except those that are safe for your particular child. I will also add (and if anyone has read my other replies they are probably sick of reading this) that our allergist by our second child told me that if breastfeeding was going successfully and I was able to keep up with his milk intake while I was at work and he was at daycare, that I could completely let go of worrying about solid foods. That, for me, eased the pressure and anxiety around food trials substantially. We did not have the formula issue you are describing but I’m hopeful that you find a solution and if so that this more laid back timeline of solid food introduction helps ease your mind a bit. Our pediatrician still made me anxious every time by asking about how much solid food my eldest two ate but after our allergist gave me that gift of a relaxed timeline I just kept reminding myself that he, not our pediatrician, was the one that knew the most about fpies and was in charge of the food introductions (as much as any allergist can be with fpies...).