Yep. Alcohol enters your breast milk at pretty much the same levels as it enters your bloodstream. Does this make it “bad?” As you might imagine, there are tons of different opinions. Some doctors, scientists, and lactation consultants say it's no big deal in moderation; others recommend holding off until baby has weaned, and still others are somewhere in the middle.
If you are going to have a drink or two, most experts do agree that you should limit it to just that: a max of two drinks a day, sipped after baby's been fed (as opposed to before or during).