A nurse is working with several clients on an acute care pediatric unit. Which of the following clients requires the nurse's immediate attention?

A. An 18-month-old crying after cleft palate repair: Crying increases tension on sutures but is not immediately life-threatening. B. An 8-year-old who is swallowing frequently after tonsillectomy: Frequent swallowing is an early sign of bleeding, a potentially life-threatening complication after tonsillectomy. Requires immediate attention. C. A 15-year-old with IV pain at the insertion site: This may indicate infiltration or phlebitis but is not an immediate emergency. D. A 12-year-old refusing to ambulate post-appendectomy: Ambulation is important to prevent complications, but refusal does not signal an urgent clinical issue.