A.D.
I started my son on cows whole milk when he was 10 months old and slowly introduced it. Start by mixing 2 oz whole milk to like 6 oz formula. Do this for 2 weeks or until you know he doesnt have an allergic reaction and its not changing his bowl movements. Then i would up it to 3 oz milk 5 oz formula for 1.5-2 weeks. Then half and half and so forth being sure to leave plenty of time for his body to adjust. I know it will be so nice to not have to mix any more formula!