K.
My son (breastfed except for when I work) started refusing bottles at 7 months and he never took one again. I had terrible mother guilt and started nursing him a lot at night (whenever he asked) to make up for it. Ultimately, though, he just ended up eating a lot more food during the day. It took him a long time before he would drink any quantity of liquid from a sip cup (he preferred regular cups). I'd suggest trying a sippy cup - your son may be perfectly happy with that once he gets the hang of it. But either way, I would just keep trying the bottle too. Don't push it - offer it to him once or twice each feeding and if he refuses, move on to some solids and try and give him sips of formula/water from a cup between bites. Don't worry - he'll eat when he's hungry.