The nurse is evaluating the activity tolerance of a 9-month-old with iron-deficiency anemia. The ...

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Rationale:
1. Tachycardia is a sign that iron-deficiency anemia is not resolving and activity tolerance is not improving.
2. Decreased alertness is a sign that iron-deficiency anemia is not resolving and activity tolerance is not improving.
3. Iron-deficiency anemia can result in less oxygen reaching the cells and tissues, causing activity intolerance. An indication that a 9-month-old child is tolerating activity and iron-deficiency anemia is resolving would be maintaining a respiratory rate of less than 50 (within a normal range for this age) during activity.
4. Muscle weakness is a sign that iron-deficiency anemia is not resolving and activity tolerance is not improving.