My 5mo old son has had really bad reflux issues and is struggling to grow. He is falling way behind developmentally. He's on Zantac, Prevacid, and erythromycin to speed up digestion. Nothing seems to be helping long term. He had a great week last week! He was eating 4.5-5oz every 2 hours with minimal spit up. Finally a growth spurt!  But this week he's back to barely finishing 2 oz and screaming and arching around the whole time he's awake. Bonus: he's skipping lots of naps during the day now and sleeping crappily at night all of a sudden!