Initially it is best to allow breast fed babies to feed on demand. For some infants this may be as frequent as every 1 ½ -2 hours. Until your baby has returned to their birth weight, feed them at least every 3 hours during the day and 4 hours at night.
You will want to ensure your baby has an effective or deep latch each time they are at the breast. This will allow your baby to take in more milk while nursing and will reduce the chances for sore nipples.