whole milk!

Grecia
Have any of you mama's started whole milk yet? I know it's suggested after the 1st birthday but my baby just had cleft palate surgery and wants only cold stuff to drink! And for some reason he hates the formula rightnow! We keep him pretty hydrated with lots of liquids but he needs nutrients!! Incase you're wondering he is on an all liquid diet rightnow no solids for a whole two weeks! Any advice would be greatly appreciated, thanks mama's!!