biting breast

Hannah • Hey my name is Hannah. I am a 27 yo SAHM 💙👶🏻 💙4/29/16 💙👶🏻 💙4/23/18
My son is 22 weeks. He doesn't have teeth yet, but he has started biting my nipples while breastfeeding. I want to nip this in the butt before it becomes an issue. What are some appropriate ways I can discipline him?