You shouldn't need to supplement at all. The first couple of days babies really don't need much so if they nurse often even if they aren't getting a whole lot it's ok. They can stimulate your milk production a lot better than a pump, but if your still concerned, by all means go ahead and pump in addition to the nursings just do it after feeding them both and don't worry if not much comes out, because they will have taken what you did produce, as they should. With twins your be nursing them twice as much as you did with your singleton so that shouldn't be a problem. Even the best lactator doesn't have milk for a day it's always just a tiny bit of colostrum until the second day at the earliest and often 3 or 4 days. Newborns have a reserve of nutrients from the womb to survive for a few days, that's why they often lose weight the first week and all doctors will say that a certain amount of weight loss is normal because the mom's milk doesn't come in, and they're just using up their reserve they always gain it right back in the next 2 weeks or so as long as they are otherwise healthy. If you still have concerns they have lacation consultants that will help you in the hospital and answer any more questions you might have. My mom is a midwife so she answered all of my concerns and questions. If you still have more questions you can e-mail me at ____@____.com Good luck with your delivery and don't worry, you can produce much more milk if you let yourself relax about it and just remember your body was made to do this so it will work.