Wow, sorry just saw the date on this post! I'm sure your baby is thriving by now! Lol
My son was born at 36wks and once we found the right flow of bottle (how many holes in the teet that moderates the flow of the bottle) he fed like a champion. Because he was prem he didn't have the energy to work so hard to get the formula out but too many holes and he was drowning in it. Was a matter of trial and error for us to see what worked and then we had to keep changing the teets as he grew. I hope this helps you, good luck and congratulations!