Okay I know this sound crazy but breastfeeding question

Abby
Okay I'm 18 with my first child I want to breastfeed till he's about a year then pump and keep him on bm till 3 but what do u do wen they start teething Ik dumb question but I keep thinking of a life time movie where the baby actually bites her nipple almost clean off Lol I'm sorry for this dumb question