The folklore actually states that beer creates more breastmilk, not wine or other alcohols. Testing other forms of alcohol and not beer will not produce the same results.
From experience, after consuming a single beer and going to bed; I woke up after a few hours extremely engorged with breastpads that were full of leaking milk. When my three month old went to drink from my breasts the milk flowed extremely fast that my baby pulled away and was sprayed. This pressure lasted a long time, and my baby had more tham enough milk.
About a week later I had another beer at a gathering and the same thing happened.
My baby has been successfully breastfed since she was born with no difficulties.
I have read many research articles done by Universities about beer and breastmilk, and it is shown that the barley content in the beer is what increases the prolactin. The same results have been seen in non-alcoholic beer.
The folklore actually states