A mother brings her 11-month-old into the clinic. The infant exhibits the Moro reflex and cannot roll from front to back. The nurse understands that these signs can indicate:

Rationale: A. Myasthenia gravis typically presents with muscle weakness and fatigue, but it does not usually cause retained primitive reflexes like the Moro reflex. It is also rare in infants. B. Spina bifida can result in motor deficits, but the persistence of the Moro reflex is more commonly associated with cerebral palsy than with spinal defects. C. The persistence of primitive reflexes (such as the Moro reflex beyond 6 months) and delayed gross motor milestones like rolling over are classic signs of cerebral palsy. D. Reye's syndrome is an acute condition linked to aspirin use in viral infections. It causes liver dysfunction and encephalopathy, not developmental delays or retained reflexes.