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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