An infant with a stridorous cry, a positive Chvostek sign, tremulousness and vomiting may require evaluation for:

Rationale: A. Hypocalcemia in infants can present with neuromuscular irritability, which includes a stridorous or high-pitched cry, positive Chvostek sign (facial muscle twitching when the facial nerve is tapped), tremors, and vomiting. Early recognition and treatment are critical to prevent seizures or cardiac complications. B. Gastroesophageal reflux may cause vomiting and irritability but does not produce Chvostek sign or tremulousness. C. Whooping cough presents with paroxysmal coughing and inspiratory “whoop”, but stridor and Chvostek sign are not features. D. Rickets is associated with bone deformities, delayed growth, and hypocalcemia over time, but the acute neuromuscular signs seen here suggest immediate evaluation for hypocalcemia.