I was feeding ours 2 bottles a day until they were 6 weeks old, then cut it down to 1/2 bottle morning and night, then cut it out completely after a week of the half bottles. They were putting away a good amount of creep as well, going to it after the half bottle of milk... they almost tell you when they are ready as I had the same question, if they are putting away what looks like a sufficient amount of creep then that is time as creep & milk together can cause problems.