I've done this calculation before and just checked it again - maybe someone else can confirm or let me know if I have it wrong:
Hale (Medications and mothers Milk textbook) says 'maternal blood alcohol levels must attain 300 mg/dl before significan side effects are reported in the infant'.
Now, that means 300 milligrammes per decilitre, and a decilitre is 100 millilitres.
So it's the same as saying 300 mg per 100 ml.
The drink drive limit in the UK is 80 mg per 100 ml.
So for effects to be seen in the baby, you'd need to be way over the drink drive limit.
300 mg/100 ml is very drunk, espcially if you are not used to drinking - I have checked this on
www.alcohol-aware.org.uk
and they say '300-400 mg % carry a high risk of death in the naïve drinker. This much can be obtained by drinking 150-200g of alcohol, equal to 6-8 pints of strong lager or 2/3 bottle of vodka.'
No one should say people 'should' drink and breastfeed, and obviously, high levels are bad for the mother as well as the baby. But we should be grown up enough to read the facts and then decide. We should also remember that people may be drunk, and not actually look or behave as if they are, and a baby might be very sleepy if he has had an alcoholic drink via the breastmilk....not good.