“I’m not allowed to bring Ben to play group anymore,” said Sarah, whose son is now five years old. “The last time we went, he bit another boy who was playing with a truck Ben wanted. And the time before that, he hit a little girl across the face. I try to tell him ‘no’ but he just doesn’t listen, so I just end up apologizing for him. I’m starting to feel like the world’s worst parent because I can’t control him when he acts out.”