N.J.
I don't necessarily know if its expected. But my youngest is a biter, and even when I don't know the parents, like at a park or something. I stomp his little behind over and make him apologize and then also apologize myself and explain we are working on and I'm sorry I didn't see it coming this time! Most are receptive some are still po'd, but I always feel better knowing that I did the best I can, which is apologize :)
Good Luck!