breast engorgement

I just had my baby 4 days ago but I already have huge breasts, and he can only eat a certain amount per feeding. I was told by a friend that I can pump and save the milk but only after a month from my baby's birth. But they're so huge! I need them to go down, but I don't want to lose the milk. Could I pump in this case? Or any methods that work for you all? I tried the warm bath but it didn't really work. Help!