for the first few days, milk flow will be low. the first few days you will only express the thicker milk called colostrum which is very rich and though little, is usually enough for babies. my first few days i only manage to express 15ml from both breasts... when i passed to the nurse, she said very good... i used the pump in the hospital to express the first few days. coz my baby was premature... no strength to suck.
manual pump very chey ... maybe you can borrow an electric one?