Feeding

My baby is 5 weeks old. Two weeks ago the pediatrician said that 3 oz of formula every 3 hours was good enough and not to up it. Well now my baby is no longer satisfied with only 3 oz. she's a bigger baby she was born at almost 9lbs. Is it too much for her to eat 4 oz at each feeding when she's this young? How much do you ladies feed your newborns? TIA!