Reducing formula

I would swap the second one of the day for a snack and then after about 2-3 weeks do the same with the third one.

We were on 2 by about 14 months then one at 15 months (before bed) and dropped them all by 17 months

Why do you need to be reducing her formula intake?

By 12 months they don’t need milk as their main source is then solid foods but it is still fine to give milk as they do follow on formula etc but if your baby enjoys milk I would suggest weaning onto full cows milk as this should be introduced by that stage anyway and just swap one bottle out at a time for cows milk and add baby multi vitamins to the milk and once you have weaned to cows milk take out the 2 middle bottles and increase slightly the amount of milk in the first bottle and bedtime bottle
With my LO I started giving her midday bottle (she only had 2 bottle a day) as cows milk and kept the bedtime bottle as formula until she was used to drinking the cows milk and then started introducing the bedtime bottle as cows milk also x

Can I ask do you warm the cows milk before giving to them? My son also needs to transition 2 bottles to cows milk soon but is used to room temp not fridge temp.

HV say they only need 12oz a day of milk. But my son is on 3 8oz bottles in 24hrs. Can’t see him reducing it.