How many milk bottles a day ladies?

Sooooo next week I will be transitioning my baby to cows milk lil by lil, but I'm so confused on when he's totally on just milk no more formula how many milk bottles a day do they drink? My son turns 1on the 27th and his Drs, apt is for the 29th OFCOURSE we will go indetail then with the Doctor but for right now once he's done with formula how much milk should a one ur old drink? Would love some feedback ...