I agree with pp, the best way to get that milk to come in is to nurse nurse nurse. Colostrum is excellent for the baby, and if they needed milk in the first day of life, our bodies would work that way. That's how I look at it. My lo was born on Tuesday and my milk came in on Thursday. We didn't give formula because I never considered it an option, I don't think it should be one (unless its an unusual circumstance). Congratulations on being a new auntie!