How many ounces?!

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How many ounces is your baby taking at each feed?! Baby takes breastmilk by bottle so we thicken it for reflux. 
My baby is a July baby but born 2 months early. Her doctor said her stomach is that of a 2 month old so I will be feeding her what a 2 month old might eat. Currently, she takes 3-4oz (closer to 4) bottles every 3-4 hours. The most she has taken was a 6oz bottle but that was bc she slept for 6 hours straight so it had been about 6.5hours from her last feed!
I just want to make sure we are feeding her an appropriate amount bc sometimes after 2 hours she is acting hungry and I have a hard time telling if it's hunger, gas or just being fussy!