The parents of a 3-month-old infant report that their infant sleeps supine (face up) but is often prone (face down) while awake. The nurse's response should be based on knowledge that this is:

Correct Answer: D

Rationale: These parents are implementing the guidelines to reduce the risk of SIDS. Infants should sleep on their backs and then be placed on their abdomens when awake to enhance development of milestones such as head control.

Correct Answer: C

Rationale: Approximately 90% of infants infected with hepatitis B at birth become chronic carriers due to an immature immune response, leading to prolonged viral persistence.

Correct Answer: C

Rationale: Prophylactic penicillin is not typically used in minor burns unless there is a specific infection risk, as it can promote antibiotic resistance.

Correct Answer: B

Rationale: A sudden drop in oxygen saturation in a patient with meconium aspiration syndrome is most likely due to an endotracheal tube blockage, often caused by accumulated secretions.

Correct Answer: D

Rationale: Rheumatic fever with carditis often presents with tachycardia, pericardial rub, and heart failure. A harsh systolic murmur at the second right intercostal space is more suggestive of aortic stenosis rather than rheumatic carditis.