A baby moves a hand to its mouth, the muscles contract, the head wobbles. For this, its muscles must collaborate, which is called coordination. It seems so natural. As adults, when we put food in our mouths, we do this automatically. However, coordination does no come so naturally, and only develops with a lot of practice. This means that repetition of coordinated movements is necessary – in this case navigating the hand towards the mouth. Babies practice with arbitrary, crisscross movements, until they succeed.

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