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: C

Rationale: Significant head lag at 8 months is concerning and warrants further evaluation, as it may indicate developmental delays or neurological issues.

Correct Answer: D

Rationale: A vesicle is an elevated, circumscribed lesion filled with serous fluid, typically less than 1 cm in diameter.

Correct Answer: A

Rationale: Preschoolers may engage in magical thinking and believe inanimate objects are alive, so the nurse should explain the equipment in a way that reduces fear.

Correct Answer: C

Rationale: For a 2-day-old neonate, the most suitable method to measure temperature is the axillary method. This approach is considered safe and appropriate for neonates, minimizing the risk of injury. Tympanic temperature measurement may not be as accurate in neonates due to their small ear canals. Oral temperature measurement is not recommended for neonates as they may not be able to hold a thermometer properly in their mouths. Rectal temperature measurement is invasive and carries a higher risk of injury and should be avoided unless absolutely necessary.