A congenital, not conditioned reflex in newborn. If both thumbs are pressed equally against the palms, there is a reflectory opening of the mouth and a twist of the head on the vertical axis until the median line, and at the same time the head is bowed forwards. It is normal in the first 10 weeks of life. If it persists after the 12th week, it is a sign of spastic-motor maldevelopment.
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