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!

[0] https://www.craftyarncouncil.com/standards/head-circumferenc...