Easily demonstrated by many measures: Basics: they poop and don’t need anyone to clean them. They don’t scream when a predator is around because they understand what can happen. They run from predators.
Simple: they can walk and run and find food for themselves at some point to become self sufficient.
Complex: they know who momma is and live in social groups for the most part. They communicate with each other.
Human babies never do any of this, and that has all sorts of ramifications that can be interpreted as funny, sad, or even cruel.
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we never eat babies…ha ha ha! Just pulling your leg. We don’t.
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we never jail babies…ha ha ha! Oh shoot.
Don’t go imagining things, it could hurt. Just think about these things while eating your delicious hamburger. Your burger meat was once smarter than a baby and had as much feelings as a baby does and more including memories. And they were jailed their entire life and were brutally murdered and pushed thru a grinder until they were just pieces of meat.
I thought the curvature was meant to act like a spring?
It’s kinda a hold over from when we used four limbs. It might have some benefit potentially but it also comes with massive health disadvantages that we pay for later in life.
But, then again, evolution isn’t really concerned with “later in life”. So long as you can reach maturity and procreate then everything that happens afterwards is irrelevant to the evolutionary chopping block.