A nurse on a pediatric unit is reviewing her client assignment following the shift report. Which of the following clients should the nurse plan to assess first?

Choice A reason: A toddler with both arms in casts who needs assistance with feeding requires support for nutrition and comfort. However, this is not immediately life-threatening and can be addressed after urgent respiratory needs are stabilized. Choice B reason: An infant with pertussis receiving oxygen via nasal cannula is the priority because infants are at high risk for airway obstruction, hypoxia, and respiratory distress. Pertussis can cause severe coughing fits leading to apnea, cyanosis, or decreased oxygen saturation. Ensuring airway patency and adequate oxygenation is critical, making this client the first to assess. Choice C reason: A school-age child with diabetes mellitus requiring blood glucose monitoring is important for metabolic stability. However, blood glucose checks can be scheduled and do not represent an immediate life-threatening emergency compared to respiratory compromise in an infant. Choice D reason: An adolescent in sickle cell crisis who is ready for discharge instructions is stable enough to be considered for discharge. This indicates that acute pain and crisis management have already been addressed, so this client does not require immediate assessment.