Does the lady in picture shown breast feeding two kids holding a beer? I think it might be harmful to consume alcohol while breastfeeding but more strange is the choice of picture for the article.
It is not considered harmful to have a beer while breastfeeding. I'm sure the subject of the photo was aware of how it would be perceived and didn't put her drink out of frame to help normalize public breastfeeding.
That said, I don't think she's drinking right now at all, just in case. Even if the alcohol clears from your bloodstream in a few hours, I would be surprised if the lingering metabolites and effect on one's endocrine system didn't effect the contents of the milk somehow.