Correct Answer: D

Rationale: The correct answer is D: Pulsating anterior fontanel. The fontanel should feel flat, firm, and well demarcated. Pulsations are frequently visible at the anterior fontanel, which is a normal finding in a neonate. A closed anterior fontanel, as mentioned, is a potential sign of a major abnormality. A sunken or bulging fontanel (when the infant is quiet) may be indicative of distress or a major abnormality. Therefore, options A, B, and C are considered abnormal findings when assessing the anterior fontanel of a neonate.

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: B

Rationale: Climbing is a gross motor milestone typically achieved between 2 to 3 years of age. It involves coordination and strength. Jumping in place is usually mastered around 2 years of age. Standing on one foot with help is a skill that emerges around 3 years. Riding a tricycle typically occurs closer to 3 years and involves coordination and balance, which are more refined skills compared to climbing at an earlier age.

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: Rectal temperatures provide the most accurate measurement of core body temperature and are therefore indicated when accuracy is essential.