I don't know how it works in medical settings, but working in education, we have regular training in child protection and safeguarding and are always reminded to report any concern, no matter how small and even if that concern is found to be nothing. We have it drilled into us every time we have the meetings. We have designated safeguarding leads we can report it too.It's a safeguarding officer who focuses specifically on adults who work with children if there are concerns. Don't need proof, just a concern and they can investigate, work with senior management and police if needed. Senior management tend to take things seriously if local authority safeguarding get involved.
I've referred to the LADO for concerns around a nurse working with children and someone who volunteered at a women's refuge so they cover all areas.
Would the hospital have people like this in charge they could report to?