rooting reflex

Medical Dictionary

rooting reflex root·ing reflex (rōō'tĭng, rut'ĭng)
n.
A reflex in infants in which rubbing or scratching about the mouth causes the infant to turn its head toward the stimulus.

The American Heritage® Stedman's Medical Dictionary
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WordNet
rooting reflex

noun
reflex consisting of head-turning and sucking movements elicited in a normal infant by gently stroking the side of the mouth or cheek 
WordNet® 3.0, © 2006 by Princeton University.
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