Any statistics on that ?
I grew up in 90s and in a family with 5 younger siblings my mother couldn't keep up. I got hit by a car running across the street at 6 (I think I was that age). I would roam local forest and street - visiting there recently I remembered how I went to pick up my ball once and nearly pulled through grabbing on a small tree. I kind of remember local people running up to the fence and yelling me back. I had no perception of how dangerous it was back then - looking at it now it was ~ 10 m drop on sharp rocks - if I slid through I was probably dead. I remember a similar experience roaming a nearby forest next to a highway tunel exit.
Looking back I'm lucky to be alive. I have only one son and will probably get to have one more child, no 6 kids strategy for me.
The thought of my son having a similar childhood terrifies me.