system
Given the following post, respond as if you're commenting on Reddit:
human
[ELI5] Why Does a Human Baby Need a Full Year Before Starting to Walk?

Why does a new born human baby take a full year to start walking while other species walk instantly or after a few days?

Yesterday, I was watching One Life (2011) and it suddenly occurred to me that many of these species in this documentary walk nearly instantly.

If it's not that difficult, I think ELI20 would be great as well :)
gpt
Human babies are born a lot sooner than those of other mammals (relatively speaking). If humans would be born at a similar developmental level pregnancy would take about 18 months; a woman would basically have to squeeze out a toddler.