Baby turning 1 soon

Zoe

So my baby is turning 1 next month and I know at that age you should give them cows milk insted of formula, but do you just swap completely or gradually at the moment she has 4 bottles a day and 3 meals when she’s 1 should she be having 4 bottles of cows milk a day or should I cut it down to 3? Also do you just heat it up in the microwave?