Correct Answer: D

Rationale: Tilting the head back without hyperextending the neck is the safest way to open an infant's airway. Hyperextending the neck can potentially cause harm to the infant, making option D the most appropriate method for opening an infant's airway without suspected neck injury.

Correct Answer: C

Rationale: After the baby's head delivers, it is typically tilted posteriorly to one side to help facilitate the delivery of the shoulders. This positioning is important for the safe and smooth delivery of the baby.

Correct Answer: D

Rationale: For a responsive 4-year-old child with a mild airway obstruction, respiratory distress, a strong cough, and normal skin color, the appropriate treatment includes providing supplemental oxygen and arranging for transport to a healthcare facility. Oxygen helps alleviate the respiratory distress, and transport ensures the child receives further evaluation and care by healthcare professionals. Back slaps and subdiaphragmatic thrusts are not recommended for a child with a mild airway obstruction and normal skin color, as these interventions are typically reserved for more severe cases of airway obstruction.

Correct Answer: D

Rationale: The pediatric assessment triangle is used to form a rapid, hands-off general impression of the child's condition without directly touching them. This visual assessment helps in identifying children who require immediate attention and further evaluation.

Correct Answer: C

Rationale: In a pediatric patient with respiratory distress, a non-rebreathing mask with a flow rate set at 6 to 8 L/min is the most effective way to deliver oxygen. This method ensures a high concentration of oxygen is delivered to the child, aiding in improving oxygen saturation levels. In this scenario, the mother can assist in holding the mask to maintain comfort and cooperation in the child while ensuring proper oxygen delivery.