That's a fair point! However, another commenter brought up the fact that human muscles are somewhat underdeveloped after birth. It might make sense that having

That's a fair point! However, another commenter brought up the fact that human muscles are somewhat underdeveloped after birth. It might make sense that having 4 legs is easier both in regards to balance, as well as because the load per leg decreases to make standing on them easier. That is probably not the only reason, but probably a contributing factor.