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

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

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Toddlers also lift with perfect technique. They get right up to their teddy bear, squat, hug the toy close to their chests with a straight back and use their legs to lift.

The explanation I’ve heard (although I don’t know if it’s true) is that they haven’t developed/strengthened their back muscles yet so they physically can’t lift with their back.

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