Many moms in Europe will drink wine or beer with a meal with no issues. In Australia, a glass or so a day (with two alcohol free days a week, conforming with normal guidelines) is acceptable. In the US there is more of a cultural stigma against any drinking while pregnant. The underlying aim is to discourage pregnant women from binge drinking or or imbibing quantities that are sufficient to harm a foetus. The reality is, in moderation it's fine just like most things.