Correct Answer: B

Rationale: To maintain the skin integrity of a preterm infant born at 30 weeks, the nurse should bathe the infant with sterile water no more than two or three times per week. The eyes, oral and diaper areas, and pressure points should be cleansed daily. It is essential to avoid using alkaline-based soaps as they might destroy the 'acid mantle' of the skin. Additionally, cleansing with mild solutions and rinsing thoroughly with plain water is recommended to prevent skin irritation and maintain skin integrity. Therefore, options A, C, and D are incorrect as they do not align with the best practices for preterm infant skin care.

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: B

Rationale: The correct intervention to maintain the skin integrity of a preterm infant born at 30 weeks is to bathe the infant with sterile water. Bathing with sterile water or a neutral pH solution is recommended to protect the delicate skin of preterm infants, which is more permeable and prone to damage. Choices A, C, and D are incorrect as avoiding cleaning the skin may lead to hygiene issues, cleansing with alkaline-based soap can be harsh on the delicate skin, and thoroughly rinsing with plain water after bathing may not be as gentle and protective for preterm infants.

Correct Answer: A

Rationale: Introducing oneself is the first step in establishing a rapport and setting a professional tone for the interaction.

Correct Answer: B

Rationale: The correct answer is B. Understanding time concepts like 'half past' can be challenging for a 7-year-old, indicating the level of language development. Choice A is incorrect as fascination with bathroom language is common in this age group but not necessarily indicative of language development. Choice C is incorrect as a 7-year-old typically cannot carry on an adult conversation due to cognitive and experiential limitations. Choice D is incorrect as by the age of 7, children should be able to speak in full sentences.