An 8-month male infant is brought to the emergency department with a fever for the past 12 hours. There has been decreased nursing but no emesis, diarrhea, or respiratory symptoms. The temperature is 39.4 C. The child is fussy but consolable. Physical exam does not identify a source of the fever. WBC is 18,000/microliter with 9% bands. How should the urine specimen be obtained?