Safety tips for drinking beer while breastfeeding
If you want to drink while breastfeeding, you must be careful. My rule of thumb is one drink per hour, always followed by one full glass of water, and I do not breastfeed if I feel anything close to buzzed. If you are feeling the affects of alcohol, then it is not out of your system.
TLDR; most modern US beers are too light to help with milk production. Anecdotal exceptions may be single glasses of either Guinness (rich in barley and hops) or non-alcoholic St. Pauli (malty).