Babies sit straight up naturally. But the rest of us have to put effort in to having good posture, why?
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Babys have a kyphosis in its whole spine while born. (Its shaped like a c from the side) while they start to crawl they have to look forward and develop a lordosis in their cervical vertebra section. Then they learn to sit and that develops the lordosis in their lumbar secrion as well. And now they have a spine that has the right curves for a upright walking life style. Short answer is that they develop the correct type of spine curvature through very simple activities and its the natural progression for them to have the correct posture while sitting so they do. Then you put them on a chair for 20 years and its no wonder why that coul change their comterble sitting position. ( the spine in a adult human should be shaped like 2 S thats connected ) https://media.istockphoto.com/id/948647114/photo/human-vertebral-column-labeled-anatomy-side-view.jpg?s=1024×1024&w=is&k=20&c=nsoWVN0LhK6rEPBFwb8R9mgCkf9BpxZU7r45jXoU6bI=
Side note, its shaped like that to make it work a bit like a spring and help absorb the impacts from running/walking on 2 legs
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