I couldn’t convince my ped to do any allergy testing until my oldest was 16 months old. I really wish that I’d done it earlier. I had cut milk and soy out of my doctor, but her other allergies never occurred to me. I ended up giving up on breastfeeding, but I probably could have kept going if I’d realized that wheat and apples were such a big deal.
So, I would try to get them to do testing. With my younger dd they did RAST blood testing when she was 9 months old and we discovered a milk allergy. She’s outgrown it now, and I think that the early discovery is a major reason.