Switching to milk HELP!

Ashley

So FTM and just offered milk to my son in his bottle...he didn’t like it so I mixed it 50/50 formula and he threw a fit...so I did 25/75 and he wouldn’t even touch it. So I just now gave straight formula and after 20 min and a different looking bottle he finally tried it. How do I get him to switch...just sloooooow milk addition increments?