Hi girls!] Im hoping that some of you can help ...

Hi girls!] Im hoping that some of you can help me. Kade is 11months and im planning on starting him on cows milk at 12 months. At the moment he has 3 X 240mls bottles (formula). Do i give him the same amount of cows milk as formula??? Another question im also hoping to start giving him his milk out of a sipper cup (st the moment he wont take it) but the sipper cups only hold about 150mls so do i just keep topping it up until he has had his full amount of milk???? Thanks in advance for your advice xoxoxo