A primitive REFLEX ACTION occurring in newly born infants in response to a sudden movement or noise. Also known as the startle reﬂex, the baby will throw its arms and legs wide and stiﬀen its body. This is followed by ﬂexion of the arms and legs. The reﬂex disappears by four months; its persistence suggests a possible neurological condition such as CEREBRAL PALSY.
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