And it wasn't just children. Before the advent of antiseptics, a prick from a briar could basically kill you. Before modern supply chains, you almost certainly had parasites. Before modern vaccines... The list is remarkably large.
I suppose there is an argument that it is the reduction of traumatic events that makes them more traumatic? Feels like a shaky reason to think "focus more and make sure you fully grappled with how traumatic it was" is the default correct approach.