A nurse is receiving change-of-shift report for a group of clients. Which of the following clients should the nurse plan to see first?

A. The new onset of lethargy in a child with endocarditis is a significant concern, as it can indicate worsening infection or complications such as embolism. This child requires urgent assessment to prevent further deterioration. B. Erythema of the lips in a child with Kawasaki disease is concerning, but this symptom is expected as part of the disease process. However, other signs like fever and conjunctivitis would be more concerning. C. An increased erythrocyte sedimentation rate (ESR) in a child with rheumatic fever suggests inflammation, but it is not an immediate life-threatening concern like the lethargy in endocarditis. D. Weak pedal pulses in a toddler with coarctation of the aorta indicate circulatory compromise, but this child may not be in immediate danger as the condition is often diagnosed and managed with interventions like surgery or medication.