sentences:  Bilateral absence of the reflex may be linked to damage to the infant's central nervous system, while a unilateral absence could mean an injury due to birth trauma (e.g., a fractured clavicle or injury to the brachial plexus).Erb's palsy or some other form of paralysis is also sometimes present in such cases.In human evolutionary history, the Moro reflex may have helped infants cling to the mother while being carried around.