What does neonatal Moro reflex mean?
Oct 07, 2022
Source: Cainiu Health
Dr. Xie Zixing
Introduction
The neonatal Moro reflex is a defensive and primitive reflex, representing a physiological phenomenon. It occurs in infants under 3 to 4 months of age. When someone approaches the baby or makes a sudden noise, the infant will extend and abduct both arms outward, then quickly flex and draw them inward toward the chest, assuming an embracing posture. After approximately 6 months of age, as higher centers in the cerebral cortex develop, the Moro reflex gradually disappears.
The newborn startle reflex, also known as the Moro reflex, is a defensive and primitive reflex, which is a normal physiological phenomenon and generally not a cause for concern.
This reflex primarily occurs in infants under 3 to 4 months of age. When someone approaches the baby or makes a sudden noise nearby, the infant may extend their arms outward and then quickly bend and draw them inward toward the chest, forming an embracing motion. This response indicates that the infant's central nervous system has not yet fully matured. Typically, by around 6 months of age, as the higher centers of the cerebral cortex develop, the startle reflex gradually disappears completely.
If the startle reflex is absent at birth, it may indicate potential neurological damage or disorders. If the reflex occurs only in one upper limb, it could be due to brachial plexus injury from birth trauma, paralysis, or clavicle fracture. Persistence of the startle reflex beyond 6 months of age may suggest chronic brain abnormalities or lesions.
