He's keeping the milk down, has some spit up but that has decreased even in the past couple of weeks. He also eats really fast even with the slowest flow nipples we found, usually finished by 15 minutes unless we stretch it out to 20 minutes purposefully. If he finishes a bottle really fast, he will still act hungry and be very grouchy. We've been giving him about 120-125 ml per feeding.
This is what it looked like yesterday, and he happened to have a bad night's sleep. I rounded the times a little.
E:800
A:820
S:900 (2 hrs)
E:1100
A:1120
S:1230 (1.5 hrs)
E:200
A:230
S:300 (1.5 hrs)
E:430
A:500
S:505 (very sleepy, he couldn't stay awake, 1.5 hrs)
E:630 (cluster feed)
A:700
S:730 (1 hr)
E: 830 (cluster feed, stayed mostly asleep)
E: 1030 (DF)
E: 300 AM
E: 545 AM
Thanks for your help!