japhrimel, I think that's the problem, though, re: alcohol education in pregnancy - there aren't any definite safe limits - in the uk anyway, the official line is this: - www.patient.co.uk/health/Pregnancy-and-Alcohol.htm
So while there are warnings about drinking more than 15 and 20 units a week, it says "the exact amount of alcohol that is safe during pregnancy is not known. This is why the advice is not to drink at all."
I feel conflicted about this. I know a lot of women feel patronised by it - it's one thing to be told not to do something cos it's dangerous, and another to be told 'best not, just in case it is.' That can feel infantilising (and also, where do you stop once you go down that road? A lot of advice about exercise seems to be based not on 'there's a strong chance this is harmful, don't do it' but on 'we're not sure if it's harmful, best not').
On the other hand, I do see that abstinence is an easier message to get across to the majority of people. I know a lot of mumsnetters pride themselves on their intelligence and education etc (though you can still find people on here saying 'but a glass of wine is one unit, right?'...), and their ability to work out and drink a very small amount of alcohol. But, there are plenty of people who have very little idea how much they are drinking, aren't really keen on cutting down, and so the info that 'a little bit is probably fine' becomes justification for drinking at an unhealthy level. And it's all very well to blame those people for being 'stupid' etc, but I don't think that's very humane or practical.
And while I'm also a huge fan of common sense, what constitutes common sense changes over time. So sadly it's not an answer to everything. When I was a baby in the early 70s, my mum was told to put me down to sleep on my front, so I didn't choke if I was sick. Now of course, we're all told to put babies down on their backs. And so on.
(Personally I actually get more annoyed by the exercise advice, given we are a nation of chronic under-exercisers anyway. I don't think not drinking for 9 months is necessarily a terrible hardship, or an abuse of human rights - whereas I do think lack of exercise causes health problems).