"Basically it was introduced in the hope that it would send a clearer message to alcoholic mothers and persuade them out of their denial."
Again, I don't think the evidence supports this outlook.
There is a lot of evidence that drinking, for example, 5-8 units a week greatly increases the risk of a variety of medical conditions.
There is no evidence, and nor plausable mechanism for alcohol to be beneficial for a foetus.
There is a lot of evidence, I just did a v.brief review of data from 2010 as an example, that a little bit of alcohol, 1-2 units a week slightly increases the risk of a variety of medical conditions.
But the increased risk for an individual is not great.
But for a population it is a concern.
As a result it could be entirely sensible for a goverenment to advise a certain behaviour and yet for every individual to choose to ignore it.
The eating of processed meat, such as bacon, is a good example.
Eating Bacon 3 or more times a week seems to increase your risk of dying from bowel cancer by 20%.
This means if you have a 100 people who eat bacon 4x a week then 6 will die of bowel cancer.
100 people who don't eat bacon will onyl have 5 people die of bowel cancer.
That extra chance for an individual might not seem important.
But when the numbers are 60million then that's an extra 600,000 colon cancer cases that the government wants to avoid.
So if 1-3 units a week leads to:
9% increased risk of placenta conditions
24% increased risk of childhood leukaemia
10% increased risk of cognitive and socioemotional development at age 3
for example, this might not be enough for a mother to want to change her behaviour.
But can you see why a government might be interested in promoting it to all mothers.