<<Disclaimer: Verify this information before applying it to your situation.>> Tim, Your experience with baking bread sounds identical to mine this past winter/spring! It WAS the tapioca flour, purchased from Dietary Specialties, as I discovered after months of checking out the xanthan gum, yeast, etc. etc. Since I switched to tapioca flour from the chinese market, I haven't had any symptoms. It might be worth a try. Various helpful celiacs advised using methocell (I think Ener-G sells it). I never bothered, after I discovered the tapioca flour problem. I did try guar gum, but it definitely causes the runs for me. A half and half guar/xanthan gum mix works OK and doesn't seem to be enough to cause digestive distress for me, but things might be different for a 2 year old. Good luck! Laura [log in to unmask] [log in to unmask] Ithaca, NY, USA