Sure you'd want to look at the total of injuries from various causes, but that by itself isn't enough to tell you what could reduce the number most effectively. Injuries involving the bed for example, for 1 year and younger; maybe the head injuries come from falling out. Or banging his head on railings. Look at that more closely and I'll bet that you could eliminate a lot of those injuries.
But you need to consider individual risk also IMO. Addressing a microscopic chance of a fall, involving practically every floor that people walk on, would not be the most effective use of resources.