I don't think you can totally prevent celiac disease by avoiding gluten during pregnancy. But as for your other question, it's exactly the opposite. By avoiding wheat, you're less likely to have a wheat allergic child. Food intollerances are usually worsened by increased exposure (actually, this is true of all allergies, which is why seasonal allergies usually get worse as you get older, or bee stings can become fatal after an initial reaction). I know that there are some folks here avoiding things while pregnant and nursing because they don't want the babes to have allergies that parents or sibblings have. I've started rotating wheat hoping to avoid an allergy in the little one. Wheat and dairy are the most common dietary allergens, mostly because they're so common in our diets now. So if you're worried that cutting wheat out of your diet will harm the baby, don't worry about it. Most likely you'll decrease his/her chances of an allergy to it.