My son is almost 3 months old. I usually pump once in the morning and once in the afternoon and am able to get 8 oz each session, so 4 bottles. He had been drinking one bottle in the morning (4 oz) and one in the afternoon (4 oz). Now he is starting to drink 8 oz in the morning. I am pumping enough for him to keep up with him right now, but is he going to require more milk? I always try to keep at least even with him, if not ahead, and most weeks I end up with 5-4 4 oz bags of milk that are excess. I put those in the freezer, or use if we go out. I am only afraid of not being able to keep up with him if he starts needing more milk! I don't think that I will be able to pump more than I already am.