Go for it. Alcohol is good for the mother - it encourages mild relaxation, lower stress levels and is good for your heart. That's just one small drink though!

25 years ago, there was so little female binge-drinking that no-one banned alcohol from mothers. Now, people don't have a drink, they go out to get drunk, so that's why the blanket ban occured. If you drink sensibly then there's not a problem with a very occasional small drink (from one of the few times I take in and obey to the letter what the midwives tell me!).