I suspected recently that LO had a milk allergy and now the pedi says he has reflux for sure. He wanted to switch formulas before using Zantac. Similac Advance didn't work and neither did Similac Sensitive or Spit Up, so the next step I think is the hydrolyzed stuff. Given that LO hasn't actually had a test for milk allergy yet, I'm wondering if there's a chance it'll help...