Eating too often?

My baby is currently 5 weeks old i understand up until 8 weeks its kind of like feed on demand not rrally a schedule but i do enter her feed times as soon as she starts eating she does good then when i realize she is showing signs of hunger again when i look it twnds to be only hour and half from when she last ate. She does eat 3 oz almost every time. Does this seem ok? Should i be concerned enough to ask her dr? Or should it balance out in the next few weeks?