Feeding soooo often!!!

How often is it normal for him to be hungry at two weeks old? In a 24 hour period he is eating between 12 and 15 times. I breastfeed him and usually give him a 2oz bottle of formula in the evening so he'll sleep a little longer. Is he maybe not getting enough at each feeding? I know that equals out to every 2 hrs but he usually eats every half hour for like 4-5 hours then sleeps for 3.