Do not have fur, they need contact with other humans for warmth.

They can't walk or run away from predators. They don't camouflage too well either.

They can't find their own food.

They have high energy requirements but a small stomach, so need to feed frequently.

Are rather a lot like Australian marsupial babies, being born helpless and needing to be close to their parents well into toddlerhood. We could learn a lot from koalas and kangaroos.