Both of my kids got teeth right after their first birthday.

I didn’t have teeth until like 11 months old then I got them all really quickly. And for whole milk, we started around 12 months with my oldest and added a little at a time to the bottles, changing the ratio of breast milk and whole milk as he adjusted. For my youngest, I wasn’t able to do the ratio thing (didn’t have any pumped/wasn’t pumping) and after a lot of trial and error, he would only drink goats milk. The ratio adjustments went much more smoothly and took a shorter amount it time.

My daughter got her teeth early and all at once, it was like 2 straight months of awful teething. We switched her to whole milk full by 14 months, I transitioned her over by adding like 1/4 milk to the rest formula after she turned one, then 1/2 and 1/2 around 13 months, and so on.