A nurse is caring for an 8-year-old child who has sickle cell anemia and is recovering from a vaso-occlusive crisis. Which of the following precautions should the nurse include in the discharge teaching?

A. Maintain an updated haemophilus influenza type B immunization: Important for preventing infection but not specific to post-crisis precautions. B. Assume postural drainage positions every 6 hr: Relevant for respiratory conditions like CF, not sickle cell. C. Avoid playground activities at school: Unnecessary restriction unless the child is symptomatic. D. Drink eight glasses of fluid daily: Hydration reduces blood viscosity and prevents sickling of red blood cells, lowering the risk of future crises.