Don't pump and dump
While it' not a good idea to drink alcohol
on a regular basis while nursing, an occasional drink is ok.
There are various recommendations - wait 2 hours after drinking before you nurse or until you feel back to normal are pretty good rule of thumb. Pumping and dumping does not speed the clearance of alcohol from breast milk, so does not need to be done. See: http://tinyurl.Com/864xezk.