A.B.
My Dr told me to introduce whole milk about a month before my sons 1st b-day. I did and he was fine. I would give him 1 bottle of milk a day for the first couple of days.Then two for a few days, then I started alternating formula and milk.Then by the third week I only gave him 1 bottle of formula before bed and first thing in the morning. By his b-day he was only drinking milk. He has done great. Good luck.