And you don't think the Ramseys were smart enough to know that they might as well call the police? Like the hospital wasn't going to report it?
The hospital would not automatically report the head injury to police. In the case of Max Shacknai, the hospital only reported after doctors determined his head injuries did not fit with the description of the accident. I think this is true in almost all cases. Children are in accidents every day. The sheer volume would make it impossible for police to open an investigation into each and every one that shows up at the ER.