Is this an age thing or a teething thing?

F

My 6.5 month old has in the last week started biting down on my nipple while breastfeeding (she has no teeth yet, though is showing all the signs of teething) and pulling away with the nipple still between her gums. She’s just about ripping my nipple off every time!!!

Does anybody else’s bub do this?? Is it because she’s teething? Or is it common for bubs to do this at this age?

Thanks in advance (: