Overview
Why Primitive Reflexes Matter
A newborn's turn toward a touch on the cheek, rhythmic suck on a finger, or sudden spreading of the arms is not a purposeful decision.
A newborn's turn toward a touch on the cheek, rhythmic suck on a finger, or sudden spreading of the arms is not a purposeful decision. These are primitive reflexes: automatic motor responses generated mainly through lower neural pathways before voluntary cortical control is mature. They protect the airway, support feeding, and provide early information about neurological function. The useful assessment question is not simply whether a reflex is “present.” The nurse considers whether the response is appropriate for the infant's gestational and postnatal age, whether both sides respond equally, and whether the movement is complete and vigorous. A response that is absent, markedly weak, exaggerated, asymmetric, persistent, or newly reappears changes the clinical priority.