system
Given the following post, respond as if you're commenting on Reddit:
human
Why can baby horses, cows and other animals walk within a short period after birth, yet for human babies it seems to take an age?

I have always been curious about this, why does it take a human + 6-12 months to simply learn how to walk, when I watched a video the other day of a calf learning to walk on all fours within hours of being born. Why and how?
gpt
Baby heads.  If they were any larger at birth neither mother nor child would survive.  Simultaneously, because of the relative size of the head to the body (and the weakness of key muscle groups) it would be physiologically impossible for newborns to walk even if they had the coordination.

Also, as demonstrated by the fact that babies crawl on all fours before walking on two legs, bipedalism is just more difficult.