hmmm, interesting question Sarah, I'm not sure if it's even possible before that milk comes in? but I suppose there are wet nurses who do it!

now that I think though, expressing prior to you milk coming in isn't recommended due to the pain and also it might not be a good idea because if you got your milk to come in earlier then bub would miss out on the colostrum.

Sorry not the best post but hey it's a reply!