A nurse is assisting in the care of a group of children on a pediatric medical surgical unit. Which of the following children should the nurse collect data from first?

An infant who had a pyloromyotomy 12 hr ago and spit up after the last feeding

A child who had a cast placed 4 hr ago and reports numbness in the affected extremity

An adolescent who has influenza and reports a headache of 6 on a scale of 0 to 10

A toddler who has periorbital cellulitis and has an axillary temperature of 37.8°C (99.7°F)