As I was going into the supermarket - big busy one with a busy car park - a small boy came running straight out, he would be 3 or 4 I should think. An older woman and I both clocked that he was on his own and as he was heading towards the car park I went to see if I could stop him and look for whoever was with him. His mum then appeared, not looking remotely concerned, and told him off as "she had told him to stay by the trolleys" while she was inside out of sight doing some unspecified thing. He had been out her sight for at least a minute, could easily have raced straight into the traffic.
Just found her reaction/non-reaction odd, but even odder the idea that a child of that age would stay put.