My milk didn't come in until day 4 - on day 3 when my milk still hadn't come in one of the midwives asked if I liked stout and I said yes (I adore Guinness) and she said have a small glass with dinner. So I did and my milk came in the next day. I'm not sure if it was the glass of stout, a placebo effect or it would have come in anyway but it worked for me.