Over the years, WLDGers have debated this issue, with no real consensus that I can remember. I found this short essay by Anna Fricke, a blogger on Alcohol and the American Life for "The New York Times" quite enlightening, and very human.
Extract:
"Babies are magical and beautiful and amazing. They are also exhausting and frustrating and anxiety-inducing. In the beginning, my daughter nursed non-stop and I didn’t even think of having a drink. Not only did I not want to risk alcohol being in my bloodstream when she nursed, I was also just too tired. Wine would only put me to sleep, and sleep was an impossibility. The first time my husband and I went out, I had a glass of wine and I felt like I was shooting up heroin in my parents’ bedroom. It seemed so wrong. When I went home, I pumped my milk and immediately poured it down the sink, an act that seemed almost as wasteful as blithely burning hundred dollar bills."
Her essay appears in its entirety on her blog at http://proof.blogs.nytimes.com/ under the title "Moderation and the Modern Mom", dated March 5, 2009.
Best, Bob