Dr. Hans-Ulrich Neumann
Specialist in paediatrics and adolescent medicine in Hamburg
If that were four pint of regular beer, then it contained about 80g of alcohol. At a body weight of about 60 kg, this results in a per mille content of 0.8. If you have stopped breastfed about 5 hours after the last glass, you still had 0.3 per thousand in your blood at that time. Because per hour, the body breaks down about 0.1 per thousand. Alcohol goes directly into breast milk, but not the entire amount you have taken. Studies show an increase in alcohol in breast milk about 30 to 90 minutes after consumption. That could explain the condition of your child on that day. The child will still get residual alcohol, but have not suffered permanent damage.
Against an occasional glass of beer after the last evening breastfeeding certainly nothing to object. Make as much distance as possible between breastfeeding and alcohol. You can also pump off milk before enjoying a glass of wine or beer to make one or two meals. In general, however: Drink as little alcohol as possible, because the child's brain is even sensitive up to the age of 20 years.
Read more in our article "Can I drink alcohol despite breastfeeding?"