Most babies normally breastfeed every 1 1/2 to 2 1/2 hours during the first month. Breast milk is digested more quickly than formula so breastfeeding is needed more frequently. Even if you cannot measure the amount of milk your baby drinks, you can tell that the baby has had enough if: baby nurses every 2 to 3 hours, has 6 to 8 really wet diapers per day, and is gaining weight appropriately.
The frequency of feeding does decrease with age as the baby can eat more at each feeding. So, don't get discouraged; you will eventually be able to do more than sleep and nurse!
From:http://www.nlm.nih.gov/medlineplus/ency/article/002453.htm