He gets his bottle (usually, give or take 1/2 hr) at 7, 11, 3, 7, and 11. He's only been on the new formula for three full days. Seems to be doing better with it, as in he's eating more during the day. He's taken 5 oz each time today (it expands up to 6) so that's 20 oz so far. He hasn't seemed quite as gassy and his spit-up is about the same. He did not sleep well last night still, so that's getting a little frustrating. The doctor told me to give it at least a week before trying something different. I actually did try the Gerber Goodstart Gentle between the sensitive and isomil and it was a complete disaster. I had the same thought about the casein and whey. He barely ate it and had super runny, watery poop and was projectile vomiting. He is on Zantac twice a day for reflux, but he has been since he was 1 month old. As for the nipple, he's using a size 2 right now. I think a lot of his problem not eating well at the DF is that he just won't wake up enough. Sorry...I feel like I didn't really give y'all a complete picture with my first post. I was in a hurry!