I took my 4mth old son for his check up this past Friday and Dr said 5oz of formula was to much. I feed him every 3 to 4 hrs sometimes it will b in the 2hr range or sometimes longer than 4 hrs jus depends when hrs hungry but anyways he takes every bottle well n if he is full he will let us know by pushing nipple out with his tongue so sometimes he won't finish full 5oz but I don't think it's too much Dr said feed him less more frequently but when I do that hes more fussy cuz he's more hungry I think 5oz is just right but then again I may be wrong cuz I ain't a Dr. How much are your LO's drinking at 4mth and how often