Final answer:
The nurse should collect data from the child with asthma experiencing dyspnea first, as it can be a sign of a potentially life-threatening asthma attack.
Step-by-step explanation:
The nurse should collect data from the child with asthma experiencing dyspnea first. Dyspnea refers to difficulty in breathing or shortness of breath, which can be a sign of an asthma attack and may require immediate intervention. Asthma is a chronic respiratory condition that can become life-threatening if not managed properly.
Collecting data from the child with a fractured arm complaining of pain can be done after addressing the child with asthma since the arm fracture, although painful, is not an immediate life-threatening condition.