FZ, I agree with you, Mumsnet is cloud cuckoo land sometimes.
There are females out there getting pregnant for money.
There are females getting pregnant without fully understanding the Biology of how.
There are females out there getting pregnant and not getting any antenatal care, because they don't bother turning up to appointments.
There are females out there who still go clubbing until 4 in the morning when 6 months pregnant.
There are females out there who refuse to give up smoking because they want a small baby.
There are females out there who would never consider breastfeeding because they think it is disgusting and perverted.
But there aren't many of these females in middle class areas, in the catchment of middle class hospitals, and in car accessable only areas. They don't tend to have access to the internet either. They don't think they are strange, they behave in exactly the same way as their friends with babies/bumps.
So the typical mumsnet user never meets them. and when she does, is shocked that they exist.
My actual point being, that I agree with Original Poster, that there are females out there who don't know it is dangerous to binge drink, but could possibly be made to care, with the right information. She has a good point. Not everyone has any common sense before they have a child, especially if they are very young.