The initial examination revealed an awake, active, 1-month-old infant in no apparent distress. Vital signs were a rectal temperature of 37.5°C (99.4°F); heart rate, 150 beats/min; respiratory rate, 36/min; blood pressure, 97/62 mm Hg; and weight, 3.8 kg (500 g more than the birth weight). His anterior fontanelle was flat, open, and not depressed. His mucous membranes were pink and slightly dry, with several adherent white plaques on the buccal and gingival mucosa. The lungs were clear to auscultation. The results of cardiac examination revealed a sinus tachycardia with no murmurs, gallops, or rubs. His abdomen was slightly distended yet soft. No abdominal masses were palpated, and normal, active bowel sounds were heard. Capillary refill was less than 2 seconds, and palpated peripheral pulses were strong. The testes were palpated bilaterally in the scrotum. In a rectal examination, normal tone was appreciated and the stool specimen tested negative for blood. The results of a neurologic examination were normal.