A nurse in a newborn nursery is receiving change-of-shift report for four newborns. Which of the following newborns should the nurse assess first?

A newborn who has forceful vomiting with feedings

A newborn who has a heart rate of 160/min while crying

A newborn who is 24 hr of age and has blood-tinged vaginal discharge

A newborn who is 12 hr of age and has not voided