I started by giving him half the formula and filling the other half with milk. My son is almost 14 months and he won't drink any kind of milk by otself
i'll try that method , my son totally knows the difference between the two milks & wont drink the whole milk by its self
I started switching .y daughter at 10mo
Say she'd drink 8 oz of formula, I'd replace 1 oz with milk
So it would be a mix of 7oz of formula, 1oz of milk
I would add more milk and less formula every week until she was on full milk
I still used the bottle and mixed 1/4 milk with 3/4 formula and moved it up every week and a half and eventually got rid of the formula then shortly after I quit heating the milk except for bedtime
I first started off by giving my son whole milk in his cereals and with his porridge. I still gave him a formula bottle at night but gave him whole milk in the mornings just using the same bottles as usual. He didn't seem to notice a difference and the change was pretty easy from my experience. I think it's easier now because they need less bottles so they're already used to drinking other fluids too.
Also I switched when he was one and a half.
When I switched I kept it in the same bottle and warmed it so it wasn't that much different and he absolutely loves it.