Correct Answer: C

Rationale: The correct answer is C. Fetal hemoglobin (HbF) is present in high levels during early infancy, inhibiting sickling unlike adult hemoglobin (HbS). As the levels of HbF decrease and HbS increases, the risk of sickling and crises becomes more pronounced, typically after 6 months of age. Choice A is incorrect because it assumes the crisis went unnoticed, which is not supported by medical knowledge. Choice B is incorrect as it questions the child's diagnosis rather than explaining the phenomenon of delayed crises. Choice D is incorrect as it does not provide the parents with the necessary information regarding their query.

Correct Answer: D

Rationale: The correct answer is D. Understanding developmental theories helps nurses anticipate and plan appropriate care based on the child's developmental stage. Choice A is incorrect because developmental theories provide a framework but do not dictate exact actions. Choice B is incorrect as developmental processes are not entirely predictable and are not meant to control a child's development. Choice C is incorrect as developmental theories are not a strict set of facts that all children follow in a prescribed manner, but rather guidelines for understanding and supporting a child's growth and development.

Correct Answer: B

Rationale: The correct answer is B: "Age-specific tasks that most children can do at a certain time." Developmental milestones are specific tasks or abilities that most children can achieve at a certain age range. Choices A, C, and D are incorrect because developmental milestones are not just about increase in body size, the direction of growth, or the age group of children. They are more focused on the expected tasks and skills children can accomplish at particular ages.

Correct Answer: D

Rationale: Play is an effective way to establish rapport with children as it helps build trust, communication, and a positive relationship. Choices A, B, and C are true statements about the value of play: A) Play helps preschoolers develop moral values by promoting social skills, cooperation, and empathy. B) Play aids in developing muscle coordination, utilizing energy, and fostering self-confidence through physical activities. C) 'Play is the work of children' emphasizes the importance of play in a child's development, learning, and creativity. Therefore, D is the correct answer as it incorrectly suggests that play is not an effective way for the nurse to establish rapport with the child.

Correct Answer: D

Rationale: The correct answer is D. Vaso-occlusive crises in sickle cell anemia require a comprehensive approach that includes adequate hydration to reduce blood viscosity, oxygenation to prevent further sickling of red blood cells, and aggressive pain management. This approach helps improve tissue perfusion and manage pain effectively. Choices A, B, and C are incorrect. Correction of alkalosis is not a priority in vaso-occlusive crisis management. Administration of heparin is not indicated as it can increase the risk of bleeding in sickle cell patients. Factor VIII replacement is not relevant to sickle cell anemia as it is a treatment for hemophilia, not sickle cell disease.