I'm not saying it's the case here but my wife says from her unfortunate experience more likely someone senior at the nursery had an 'Oh ****' moment, and 'beat' the OP to reporting it. Kind of 'We have a child in our care who comes to nursery with bruises', before the OP could ring and say 'My child went to a nursery and came home with some unexplained bruises'. If you know what I mean. You know how they say HR is there to protect the company, not the employee, and they're not your friend? A bit like that. As I said that doesn't mean it's the case here but my wife is highly experienced (and highly qualified) and saw this type of behaviour much more than anyone would like to admit.