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It's very low risk during breastfeeding, and is often encouraged even in the U.S. although some people don't know that it is okay. There is speculation that certain ingredients in beer actually boost supply. The amount that goes through to breastmilk is negligible (i.e. like less than really ripe fruit) and your biggest risk is dropping baby (or rolling on it--you do need to take serious precautions if you co-sleep, even if you've only had one or two).