pumping doesn't get all the milk out from your breasts.
good idea to let baby latch on whenver baby is hungry. before feeding, you might want to check if baby is uncomfortable-- wet, hot, cold etc-- because bbs fuss for diff reasons.
dont't watch the clock if bf is not established yet. make sure that baby is latched on correctly, if not, baby can suck for hours and still not be full.
and poor mummy will be suffering from nipple pain.
can try pumping for about 10 min after baby sucks to increase volume.