Could the injury have happened after the intubation at 3pm?
Probably way off the mark but looking at some pictures of what intubated newborns it looks like tape around their mouths with the gizmo taped in place so minimal cries/screaming heard.
In fact, you shouldn't be able to hear any sound at all when a baby is intubated as the ET tube goes through the vocal cords. If you do, the tube has come out!
This baby was moved into Room 1 by now. I'm guessing there was a lot going on, with people rushing about sorting stuff out. So not sure if anyone would have the opportunity to do deliberate harm.