system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why most animals can walk after birth but human babies and some others take a long time to learn?
gpt
Humans are fairly unique among animals, in that the brain keeps growing after the baby is born. This is because human brains are so large, compared with our bodies, that human physiology is stretched to its limits at childbirth to try to accommodate it.

Human babies' heads are huge compared with their bodies! Women's pelvises are thus huge compared those of most animals, so as to be able to give birth to such a large head. Even so, the baby's brain will need to grow bigger. As a result, human babies' skulls are designed to expand for the first year or so after birth, before it fuses solid. It is during this time in the brain's development that the necessary brain function to walk appears.

Whereas animals are born with brains that developed fully inside the womb. This is why they can walk straight away.