How many weeks premature is your baby?
My baby was born at 36 weeks. Considered borderline premie. If i didn't recall wrongly, he was drinking as much milk when he was 1.5 mths.
My pediatrician gave us this formula to calculate how much he should be drinking over 24 hr period.
Upper limit: 200ml x baby's weight in kg
Lower limit: 150ml x baby's weight in kg
If over 24hr period you're feeding between the limits, it is enough. During growth spurts, my son will demand every hr. Usually growth spurts will last for a few days only and during that period, babies will be exceptionally hungry.
We bought a kitchen scale (yeah... kitchen scale) to weigh him to make sure that he is gaining weight every few days.
As for the bloatedness, do you feed any colic drops? It also helps to burp her often between feeds.
First few weeks I fed my boy every 2 hours. At 1.5 mths, it was every 3 hours. 7 feeds a day.