Everything absorbed by the gut goes through the liver before it reaches the systemic circulation. This doesn’t necessarily invalidate your overall point (that

Everything absorbed by the gut goes through the liver before it reaches the systemic circulation. This doesn’t necessarily invalidate your overall point (that a foetus may be exposed to some alcohol, as it depends on how efficient the first-pass metabolism of alcohol is) but it does impact your logic. https://en.m.wikipedia.org/wiki/First_pass_effect https://en.m.wikipedia.org/wiki/First_pass_effect