I would latch him off , wait a few seconds then let him feed again.

Also a wet towel/rag ... for him to chew on works that way they can bite on that since their gums are itchy

My daughter is three months and though no visible teeth yet she's def in the stage of teething . She pulls on it and naws on it . I do the same as far as discipline I just don't know how she'll take bottle cus it's only gonna get worse

I've taught her no in a stern voice if she bit I also would take the breast away she only ever bit when her teeth were coming through my daughter is 9 months with 6 teeth and I still nurse her exclusively since she never takes a bottle with mama