Eli5: why do babies sit with perfect posture when they learn to sit, but the older you get, the worse it gets?

Question

Babies sit straight up naturally. But the rest of us have to put effort in to having good posture, why?

In: 1304

Answer 1

Chairs are very bad training for good posture. With your feet essentially dangling under your knees, you are able to slouch. If you’re sitting on the floor, you naturally sit with a straighter spine.

Babies haven’t gotten used to chairs yet, essentially.