An infant with a continuous inspiratory and expiratory stridor may be exhibiting symptoms of:

Rationale: A. Hypocalcemia typically presents with neuromuscular irritability, such as tetany or seizures, not stridor. B. Increased intracranial pressure manifests with headache, vomiting, bulging fontanel, and altered consciousness, not continuous stridor. C. Continuous inspiratory and expiratory stridor in an infant is a hallmark sign of an upper airway obstruction, which may be caused by congenital anomalies (e.g., laryngomalacia, tracheomalacia), foreign body, or airway mass. Prompt evaluation is necessary to assess airway patency and prevent respiratory compromise. D. Vocal cord paralysis often causes a weak, hoarse cry or intermittent stridor but usually does not result in continuous inspiratory and expiratory stridor.