Once forensic physicians believe a child might have been shaken, their next step is to look for a perpetrator. When they call in police and child protection, the investigation starts in earnest. It all starts inside Victoria's beloved Royal Children's hospital.  For exclusive content and additional reporting on the case, available to subscribers of The Age and The Sydney Morning Herald, visit theage.com.au/podcast/diagnosingmurder. Subscribe now to theage.com.au or smh.com.au to access the special Good Weekend investigation.See omnystudio.com/listener for privacy information.