I am sorry to be so blunt RachelZ, but your advice is plain wrong.
I don't think one should be dispensing advice contrary to evidence-based medical research.
There are few things as well-studied as the effects of alcohol on the fetus. While likely only extreme cases of alcohol intake will lead to FAS, there are recent, well-designed studies that have demonstrated that as little as ONE drink per WEEK, has led to a lower head cirumference compared to the controls. In EVERY case.
Now this is an effect that can actually be measured, imagine all the things that can't be so readily measured.
While this is not designed to make anyone feel guilty about having drunk during pregnancy, I think it's important to not try and alleviate any such guilt by trivializing the effects of even a small amount of alcohol on the fetus. We just don't know. And it's one hundred percent preventible.
I am a drinker. I love my cocktail in the evening and my glass of wine with dinner. I missed alcohol like crazy during pregnancy. But when it's time for my child to misbehave or have a tantrum, or a learning disability, or whatever, I don't have to wonder whether it was those few drinks I had while pregnant.
It's not a common sense thing. It's one hundred percent NO thing.
Should it be "disallowed"? No. One can't legislate morality. But the RECOMMENDATION should be that NO amount of alcohol is common sense during pregnancy. You take your chances. It's as simple as that.