I can't imagine having alcohol in my system and breastfeeding. Some people just should not have children. How horrible.
My French-Canadian sister-in-law will have a glass of wine and breastfeed. Says it helps calm the baby down. All her kids are intelligent and well-mannered, BTW.
If you have a glass of wine and .05% blood alcohol your baby is getting a negligble amount.
It's the being DRUNK and smothering the child that's the problem.