You mention that the baby's lips were not originally flanged out. Are you sure baby is nursing with flanged lips when you aren't there. What about having mom use a hospital grade electric pump with a double set-up and supplement with pumped milk using a supplemental nurser system? If that isn't the problem, it seems to me that a second opinion from a physician or a speech therapist, occupational therapist, or physical therapist trained in infant feeding disorders would be appropriate. Eliminating milk seems like a good idea. If there is a strong family history of allergies, eliminating other allergenic food might be a good idea, or what about a consult with a pediatric allergist? Please let us know how this comes out. Bonnie