Autism is a sensory processing disorder in which your brain receives too much stimulus. This it makes sense it would occur when you have too many neurons (or connections) as that would cause increased response to any external stimulus.
Well, it seems logical that any "overgrowth" would need more space - but it looks like our skulls are malleable and continue to fuse into adulthood. I wonder if there's a process where they grow to the size needed by the brain?
TIL that our heads grow by about ~8% (in circumference) after we're tweens [0]. Cool!
It’s not because of “skull pressure”