Candy. It must be just horrible to hear a child crying like that, not knowing what the problem is. I would definitely call the numbers that emmy gave you and get their advice or they will check it out for you. You have no way of knowing whether that child is in danger and it MUST be reported.

I'm assuming that the mother offered no explanation when she came to apologize?

I think that the safety of the child must come before anything else. I hope you will call.