How much should my newborn be eating?

My daughter is 11 days old and since we left the hospital she was eating 2oz every 3 hours because she had jaundice so the doctor said i needed to wake her that often to feed to help get the jaundice away. well ever since she was about 6 days old i feed her 2oz if she eats every 3 hours and if she waits 4 hours to eat then i feed her 3oz. Well today she has been fussy ALL day and has barely slept and she acts like she is still hungry, but i don't want to feed her too much. She was 6lb 3oz when she was born, so she is a small baby. I just don't know if i should feed her more or what? I'm calling the doctor tomorow to ask, but i just wanted some opinions and was wondering how much everybody elses newborns were eating?