transitioning to whole milk

hi ladies, i have a couple questions when it comes to this subject.

my son has been breastfed exclusively since he was born, i posted a little while ago that he isn’t very interested in solid foods, or even purées. only takes a few bites of baby food before getting squirmy. i am looking to stop breastfeeding or slow down (maybe only in the morning and night) and switch him over to whole milk. has anyone gone through this? have any suggestions? how do you suggest i serve the milk?

just to add- he doesn’t like formula, he’s been breastfed since he was born and at one point i tried to get formula in there as well and had no luck.