Giving birth, for humans, is dangerous. You've got this big-brained head to squeeze through your "birth canal".
Isn't there a better way? Perhaps that favored by marsupials? Why not squeeze the young out early, and allow their later development to take place in an easy-to-exit pouch?
If people were in possession of pouches,
like those that belong to kangaroos,
birth would not involve terrible ouches,
since virtual preemies would crawl outside,
ready to jump in the pouch for a snooze
and a multi-month ride.