Correct Answer: D

Rationale: In two-rescuer child CPR, the correct compression depth is one third the diameter of the chest. This depth can be achieved by compressing the chest with one or two hands. It is crucial to follow the correct compression depth guideline to ensure effective chest compressions and circulation during CPR for a child.

Correct Answer: C

Rationale: Expiratory grunting is a significant sign of inadequate breathing and respiratory distress in infants. It indicates that the infant is struggling to exhale properly, which can be a sign of various respiratory issues, including lung problems or airway obstruction. Monitoring and recognizing this sign promptly can help in providing timely interventions to support the infant's breathing and prevent further complications.

Correct Answer: B

Rationale: When assessing for a pulse in an unresponsive 6-month-old patient, the brachial artery is the recommended site for palpation. This is because the brachial artery is easily accessible and provides a reliable indication of the patient's circulatory status in infants.

Correct Answer: D

Rationale: The appropriate ventilation rate for an infant with an advanced airway is 8 to 10 breaths per minute.

Correct Answer: C

Rationale: A prolapsed umbilical cord is dangerous because the baby's head may compress the cord, cutting off its supply of oxygen. This compression can lead to oxygen deprivation, potentially causing significant harm to the baby. Immediate medical intervention is crucial in such cases to prevent adverse outcomes.