A nurse is caring for a 1-week-old newborn who has hyperbilirubinemia and is being treated with phototherapy. Which of the following actions should the nurse take?

The correct answer is B: Monitor the newborn's temperature every 2 hr. Hyperbilirubinemia can lead to increased risk of dehydration, which can affect the newborn's temperature regulation. Monitoring temperature every 2 hours is crucial to ensure the newborn is not becoming hypothermic or hyperthermic. Checking the eyes every 8 hours (A) is not directly related to managing hyperbilirubinemia. Placing mittens on the newborn's hands (C) may hinder assessment of perfusion and circulation. Applying lotion to the newborn's skin (D) is not a priority in managing hyperbilirubinemia.