TweetChildren sucking on their thumb (and/or fingers) is a common, normal behavior. Sucking is so naturally comforting that humans suck their fingers and toes as early as the womb. Even apes, chimps, and lemurs have been known to love the thumb! [Insert cute-thumb-sucking-baby-monkey-photo here:] Despite its normality, having a thumb-loving child causes parents concern. The [...]
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