Hi there, my oldest child is also allergic to wot seems to be everything. it can be a nightmare, but u should consider having your children checked by a dietacian through your GP, i did this and thankfuly wegot loads of help including a very hard to come by baby formula as my child is allergic to dairy, wheat, gluten and soya. they can do a test to see wot exactly they are allergic to, which mean u could be able to get the correct foods for them and possibly on prescription. Also with my chiold i found that if she did eat something that she shouldnt of she got very bad dry, soreand cracked skin aswell as tummy ache and dioherra, hope this may help x x