DS was a biter, he grew out of it pretty quick.

Dd2 is also a biter, we just keep an eye on her and grab her before it happens. Usually it's when one of her siblings had made her cranky so she lashes out.
We're all kind of cautious when she wants a kiss too lol

They do grow out of it, I promise. And it's nothing you have done, some kids are just biters