K.L.
My daughter has life threatening allergies to dairy and did to eggs when she first started pre-school. We still pack her own snacks and the teachers/other parents would check with us as far as birthday treats. We would always have treats at the school should someone forget to ask and she was allergic to the item. I understand as a parent how it feels to have your child not partake in the same snacks/treats, but they do get used to it. For my daughter, who has had two unfortunate allergic experiences with epi-pens and trips to the emergency room, not eating certain snacks/treats is fine with her. The other day, though, the kids at preschool had fruity cereal and she couldn't have any because they weren't sure if she would be allergic to it. She was definitely disappointed, but we let her have some at home. Kids adapt to situations and I would just have the teachers not offer the acidic foods that you think cause the upset stomach and accidents. Best of luck and hope that he out grows his sensitivity soon.