How much should my 4 week old be eating?

She is taking 4 ounces now but seems very cranky and not easy to put down for naps after eating. If not right away then an hour later she is up screaming. She is eating every three hours, 4 ounces after breastfeeding. Last night was really rough. I am thinking of going to at least 5 ounces but I'm not sure that is the right move.

Re: How much should my 4 week old be eating?

Mine is 4 1/2 weeks and he takes a little over 4 oz and eats every 3hrs on the nose. Only once a day, like from 6pm to 10pm does he seem to want more, he will want to nurse every hour or two hrs instead of waiting the 3. Its his fussy time.