Review Question - QID 210864

A 3-month-old infant is brought to her pediatrician for a well-child visit. The infant was born to a 22-year-old mother via a spontaneous vaginal delivery at 38 weeks of gestation in her home. She moved to the United States approximately 3 weeks ago from a small village. She reports that her infant had 2 episodes of non-bloody and non-bilious vomiting. The infant's medical history includes eczema and 2 seizure episodes that resolved with benzodiazepines in the emergency department. The infant's temperature is 99.2°F (37.3°C), blood pressure is 91/52 mmHg, pulse is 118/min, respirations are 35/min, and oxygen saturation is 97% on room air. Physical examination is notable for a musty body odor, eczema, and a fair skin complexion. Which of the following is the most appropriate next step in management?