Sometimes I did feed my bottlefeed baby mama milk every hour. They go through growth spurts too. But it was NOT 6 oz in a sitting.
That makes me think your bottle nipples let him have too much too quickly or they are too easy for him to suckle from.
My guy still takes 4 oz, but Im not feeding him that every 2 hours now. Usually, he topped out at 30-36 oz/day. There was the rare day just recently where he wanted 40+oz, but that was a fluke, and he only took it in 4 oz increments...just 10 times. But that is why you pump and pump and pump to start...I could stand on my potential supply and made it through.. And once they get to 6-7-8 months, solids can help with the pressure on your supply.
to all the unsupportive people.
I still think you should nurse this baby. You would not find yourself questioning yourself like this. You could just say to people, "I don't know. I'm breastfeeding!" and how can they argue with that?!