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totally - but to be clear the question I have is more like "where in the body is this knowledge encoded (for lack of a better term)"

Do you have neurons in your brain that are pre-wired for these things? Is that encoded in your DNA? Like physically how is it inherited and the selective pressures applied?

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Yes, yes, and you got it. Largely it’s DNA that controls development of neurons/muscles/etc. that mediate nursing, walking, and so on.

On selective pressures: human babies that aren’t born with the ability to nurse, or foals born without the ability to walk—because their in-utero development didn’t allow it—historically don’t survive, and thus don’t reproduce.

I think it's a chemical structure reacting to an energetic stimulus.

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