To me it's the same as a bartender being on the hook for giving a patron one two many beers (if some dude kills someone after downing a bunch at his bar, OP would be on the hook); in this case one is one too many. If he gave her the beer and she had a deformed baby, she would probably sue on those grounds. OP can't win, but as far as I'm concerned he did the right thing.
KT
Yeah - I would have thought if you sold her the beer you'd be on the hook for any complications the child might have had. TBH though with a regulated substance you should have known all the ins and outs of distribution. When she pushed you should have told them you would need to check with the management
I was really suprised thats whet you got fired over it. Maybe they didn't already like you for some reason or your boss is just a dick