Is alcohol safe while breastfeeding?

What does the evidence say about alcohol while breastfeeding?

1. Waiting at least two hours after a single drink before nursing is the standard advice, and there is no need to express and discard milk, since alcohol leaves your milk as it leaves your bloodstream. 1
2. Each standard drink takes roughly two to two and a half hours to clear breast milk, and every additional drink adds the same window again. 2
3. Pumping and discarding milk, drinking water, having coffee, or exercising do not speed up how fast alcohol leaves your system. 2
4. Five or more drinks can reduce milk letdown and disrupt nursing until alcohol levels come back down, and a 0.3 gram per kilogram dose was followed by about 9.3 percent less milk two hours later. 3
5. More than two drinks a day on a regular basis may be harmful to your baby and has been linked to drowsiness, weakness, and abnormal weight gain. 1

How alcohol changes by nursing stage

• Early weeks. Feeds are frequent and unpredictable, which leaves almost no margin for waiting out a drink. Many parents find it simplest to hold off until feeding settles into a rhythm.
• Established nursing. Once feeds space out, a single drink taken right after a feed usually clears well before the next one. Nurse first, then pour.
• Weaning. Fewer sessions means longer windows, so timing gets easier. The two to two and a half hours per drink still applies to whatever feeds remain.