My daughter just turned a year old 12-28 so this is fresh in my mind
I started giving her a small amount of whole milk at meals starting about 11.5 months old. Luckily, she loved it and had no bad reactions from it. So after about 4-5 days or so I'd increase the amount gradually until by her birthday she was getting 100% milk. And now, not only is she off formula (thank you God! I needed the money) but she's off bottles too. Its going great and was a very smooth transition! Goodluck and enjoy your almost toddler.