This same theory was promoted by Desmond Morris during one of his
documentaries.  I think I saw it, oh, 4 or 5 years ago.

Debbie McCallister
Louisville, KY

>  As best we can tell, it comes from
>  breast-feeding. Babies seeking a breast on which to suck make
>  a nodding motion, which mother and child both understand as a
>  positive gesture. Infants shake their head away from the
>  breast when they've had enough or aren't hungry.

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