" It's possible that in response to negative emotions, humans have developed a system that closes the mouth so that they are prevented from yelling, biting or throwing insults".
As a grandfather-to-be, it's nice to be reminded of these. Read the full description of the milestones at cnn.com: http://www.cnn.com/2007/HEALTH/parenting/06/07/par.baby.milestones/index.html .
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