I, very reluctantly, have to start my DS on formula. I have been back at work now for almost 5 months and the very large supply I had is just about gone. I will be continuing to pump and nurse as much as I can but I am not able to keep up with his demand. He will be 6 months on the 19, and he is eating about 30-40 oz a day... He is a big boy! He also gets some solids (mostly veggies) maybe once every other day or so. My question I guess is, how do I introduce the formula? Can you mix formula and BM? Should I start him with 2 oz. first? Or just give him a whole bottle?