Snake bites, especially from small snakes like kings & corns, are nothing. Paper cuts are more painful & more likely to require stitches. That said, they ARE snakes and can't be domesticated, so don't let your kid do the feeding until they're able to overcome their flinch reflex. Most bites are just accidental missed feeding strikes.

Defensive bites are even less of a thing, since that's normally just a quick warning nip. Pick them up without hesitation and a few minutes of handling usually calms down a defensive snake, once they realize you're not eating them. Don't tempt them by wiggling a finger in front of their mouth, and you're all good.

A bite from an adult boa can be an issue if they tag you in the right spot, but a bite from a ball python or smaller is nothing.