Because we evolved to favor large brains over other things. Unfortunately, our large brains and skulls are too big for the anatomy of women to give birth to, so we also evolved to give birth before the baby is as physically developed as some other animals. A ton of growth development happens in the first year. In fact, the 1st 3 months after birth is referred to as the 4th trimester because of how much development takes place. It is almost as if they should be born 3 months later, but that would have ended up killing most women, so evolution took the other path.
Animals that evolved to be able to get up and walk so quickly are generally grazing, or herd animals, and evolved that way as a survival mechanism, to be able to move with the herd and keep away from predators. A human can pick up and carry their baby to safety, but cow or horse can’t.
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