Could they tolerate soy oil &/or lecithin?
Have cut out obvious soy and most hidden stuff (along with dairy, beef & egg) but yesterday ate out and had two things with soy oil as ingredients and nothing else different. E is very unsettled, started last evening (so about 4/5hours after I ate the food) with gas/spit up/explosive poos...she normally has some wind but never this bad or a lot of spit up since I cut the above mentioned foods out.