"A number of studies have linked heavy drinking on a regular basis during pregnancy to stunted growth, birth defects and brain development problems.
Less clear is the effect of occasional binge drinking, which amounted to about 5 drinks in one session in the studies Gray and his team reviewed."
Click here to read the whole article by Reuters, "A few drinks during pregnancy might be OK" the article is dated November 14th, 2007.
Personally, I think common sense dictates that a drink or two, once in a long while, will not cause birth defects in a normal, healthy pregnancy. I severely emphasize common sense, and personal responsibility. I am not advocating one side or another, only that the gestating woman seek all facts and weigh them in accordance with the personal knowledge and understanding of how her own body functions.