My mum drunk a pint of Guinness every single day for the nine months she was pg with me, it was recommended by the doctor.
I have absolutely no ill effects.
On the other hand, I know someone who really is an alcoholic, who drunk several pints a day minimum, and now has a child with FAS, it's really fucked her kid up, at nearly 4 he is the size of an 18 month old, still in nappies, still not talking, and she is absolutely blind to her involvement in his issues , despite SS involvement.
So I have actual experience of this shit.
Look, what she is drinking is fine.
In most of Europe, this would be completely normal and healthy, my Spanish friend drank a small glass of wine every night while pg, as do the vast majority of her compatriots.
UK advice is based on the, frankly offensive, assumption that literally no mother is capable of being restrained, and that as soon as we get a glass of wine in our hands we will drink till we puke.
It caters to the lowest denominator, those who cannot judge or think for themselves, and who wouldn't think twice about drinking to exces, despite thte fact that those are people who wouldn't give a shit even if drinking in pg was made illegal.
We absolutely cannot start dictating, no matter how unpalatable, what women can and can't do with their own bodies, whether pg or not, that way madness lies.