How much does 2 month old eat?

curlieq1981@yahoo.com

My LO is 2 months and 1 week and seems to be eating more and more every day.  I am breast feeding and she gets fed in the morning before I leave for work (1/2 hour), then gets bottle fed breast milk 15-18oz during the day, and then breast fed another 1-2 times in the evening.  Is that too much???  I don't know how much more I will be able to pump if she keeps up like this!