whenever I ask the pedi, they always say "150ml/kg/day with the average being anywhere from 120-180ml/kg/day". I don't follow that too strictly myself since my baby might have a small appetite one day, but pick up her appetite the next day. Unfortunately each baby is different but if you write everything down you might find a pattern. My baby is gaining weight, so I just let her stop eating when she refuses the bottle 2 times. Is your baby gaining weight? If you write more information (weight / time of milk intake/ quantity of milk intake / time of bowel movement) down you will see a pattern which can help determine if things are "normal". If you are really worried with the data you have collected then you should consult your doctor.