You got the point, we have an oversized brain size compared to our body, so we have to get birth early to pass through the birth canal. If you take the brain si

You got the point, we have an oversized brain size compared to our body, so we have to get birth early to pass through the birth canal. If you take the brain size (compared to the body) as proxy for intelligence of course bigger brain imply early birth. Now, does a bigger brain mean more intelligence?