We just got the ok from the doctor to let our 19 day old feed on demand. We were feeding her 2 oz. every 2 hours during the day and 2.5 oz. every 3 hours at night. Now though she's napping about 3 hours a day so I fed her 3 oz. unfortunately that didn't seem to satisfy her. Should I feed her more since she's still rooting? And should we be feeding her more than 3 oz. at night if we want her to sleep longer?