My first took a good month or so to transition with slowly adding more whole milk to his formula. My second turned one last week and has gone straight onto whole milk with no fuss whatsoever xx
i did a straight swap and mine hasn't batted an eye! xx
We started by just adding an ounce into his evening bottle and then slowly kept adding more until the formula ran out! I was so worried about the transition but it wasn’t bad at all! He does still like the milk wanted a little. Just to like room tempature. So working on cold milk now lol.