I would ask your pedi to be sure. Some doctors say a year, some say it's okay earlier. I'm still breastfeeding and I asked ours if it would be okay to introduce whole cow's milk at 11 months (telling him that the girls eat cheese, yogurt, etc. and don't appear to be allergic to dairy). He said that sounds fine, but to just be watchful of any allergic reactions since there are a lot of allergens in milk.