You can use cabbage leaves but the effectiveness of the same is just hear say. You can pump some milk if you are feeling heavy but remember that if you express you are just signalling your body to keep producing this same quantity. If you feel you have over abundance of supply, wear a supportive bra, express only to comfort and feed baby on demand. Your supply will settle down.

why do u wanna reduce your breastmilk ? don't worry. try to pump out extra milk. once ur baby is older it will be regulated. I had the same experience and I also used to think that I should take to stop overproduction of milk. but I got to know from a lactation consultant that breastmilk is solely regulated by ur baby's needs. so don't do anything to reduce it. it will be OK in few weeks time.