Can someone do what's being suggested, and immediately report back to that person who appears to know something, but needs someone from the audience to do all the proofing!
I would, but there are no Neanderthals from 30k years ago. Cro magnon was basically a modern human, with a modern human skull shape (at least, to me, who knows very little about skulls)
It's practiced in many cultures throughout the world, and it doesn't seem to hurt the kids or cause them major psychological issues, it just makes their skulls a weird shape.
Considering some of the extremely painful body modification practiced on children in some cultures, I'd call this pretty mild comparatively speaking.
It really was done everywhere. And relatively recently, even in Europe. Here's someone who had it done to them in France in the age of photography.