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

Babies want to sit up the “right way,” by spring their spines with their muscles. They play and develop their bodies by using them. Then we make them sit still for ridiculous things like circle time and direct instruction. Then they learn to slouch, support their back with their bones, because it’s not natural to sit still that long and the muscles can’t do is