Babies sit straight up naturally. But the rest of us have to put effort in to having good posture, why?
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One thing to consider in addition to these good answers is that babies are way way less massive than adults and our strength doesn’t necessarily keep up with our volume, so good posture and most effort in general becomes more difficult as we grow.
It’s like how ants have incredibly skinny appendages and yet they lift relatively incredible weights and they don’t really get injured from falling from any height, right – they are *strong for their size*. If you used a Science Ray(tm) to make ants huge like in those horror movies from the mid 20th century they’d just be crushed under their own weight and unable to stand at all because their legs don’t scale up to hold all that weight.
There is an ELI15 for the math at work that demonstrates this called the “cube-square law”, but *very basically* as you grow a creature its capacity for strength goes up by a factor of 2 its volume goes up by a factor of 3. This doesn’t 100% map onto a baby becoming an adult because our proportions change quite a bit, but the general idea is still in play; small things need small strength to hold up, big things require way more strength to hold up.
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