I detach my daughter every time she done it, eventually they get it and stop doing it.
I put my boob away and tell her to please not bite mommy 🤣 then I switch sides and if she does it again I take her off and sit her up for a little bit then try again
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The NHS website says to break their latch and put them back on. They learn not to eventually apparently. I've just read that though in preparation because my girl has teeth coming through!