9 month old baby refusing milk

Anna

My almost 9 month old was having 2 meals a day and now i upped them to 3 because he is refusing his bottle he barely drinks 16 oz and with lots of effort and distraction for him to finish it. I tried letting him drink in sippy cup instead but it didn’t work. How much are your babies drinking? I read a lot that his main source of nutrition at this age should still be milk but what can I do