im curious how frequently your 4 mo eats? Mine takes anywhere from 3-5 oz (breast milk) at about 3 hrs apart. My folks babysit during the week and I think he could stretch out the timing even more but my dad keeps him on the clock for fear of him getting hungry and crying, I think. We try to tell him to just watch for cues and that he can wait quite a while now, but I'm curious if this range is around what others his age are doing. I read that some go more like 5 hrs between eating, but I know he's still eating relatively small servings and all babies are different!