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That comes up every once in a while, and of course breastfeeding and wet nursing are absolutely fine. People are sometimes tripped up by the fact that human breast milk is technically an animal product, too, but of course mothers/wet nurses can give their milk willingly, unlike animals that are abused for theirs.
https://www.vegansociety.com/resources/nutrition-and-health/life-stages/pregnancy-and-breastfeeding
How do vegans feel about breast milk / breast feeding?