the breast does give a bit of whatever the mother drinks, I was breast fed and my mom warned me about it when I had my daughter. I was very true that she slept longer when I had a glass of wine, but I was always careful to have a few bottles worth saved if I planned to drink much.
yes, this is true. That's why they tell new mothers not to eat onions and all that. Cause then their breast milk will upset baby's stomach, because of the onions.