There probably aren't any reliable stats on the incidence of SN four or five hundred years ago, when everyone drank beer all the time because it was cleaner than water. But, you know, the human race isn't extinct yet. And in the middle of the last century, pregnant women were encouraged to drink alcohol - Guinness for the iron, red wine 'for the blood' and generally because alcohol was supposed to prevent premature labour or something.
The brutal truth remains: you can be as obedient and self-denying as you like during your pregnancy and still have a baby born with problems of some kind. Faulty gene combination, accident or medical incompetence during the birth process, inadvertent exposure to something harmful in your workplace or home or just shit bad luck somewhere along the line.
There have always been plenty of people wanting women's rights and full human status removed or restricted, and it's always been pushed on the grounds that women have babies and that's the only important thing about them, it's what they're for.
So just think a minute about the idea that no woman of childbearing age should be allowed to drink alcohol in case it harms a foetus. That would include women who have chosen to be sterilized as they don't want children (or any more children), women who are celibate, women who are lesbians, women who have completed their families, women who are infertile... We are 'of childbearing age' for over half our lives, which is a fucking long time to spend being treated as potential incubators rather than people.