What sort of stool tests are they doing to determine it "might" be lactose intolerance? If it was, I would think he would be very sick, not just gaining slowly. It's more likely that he has an allergy/intolerance to something in your diet. Soy is a very common allergen, as are eggs, gluten, and corn. If you eat soy, I would cut that out of your diet first and see if anything changes.
7/6/11 at 9:43am