A 2-year-old toddler was rescued after being submerged in a bathtub for approximately 3 minutes and brought to the emergency department. The child is currently awake but irritable, with a respiratory rate of 38 breaths per minute, oxygen saturation of 91% on room air, and a temperature of 35.5°C (95.9°F). The nurse notes mild intercostal retractions and fine crackles on lung auscultation. Laboratory results show mild metabolic acidosis. Which nursing action should the nurse prioritize during the first hour of care?