Correct Answer: A

Rationale: In a tetralogy of Fallot situation, placing the infant in a knee-chest position is the initial priority to help increase systemic vascular resistance, which reduces the right-to-left shunt and improves oxygenation. This position can assist in optimizing oxygen levels before considering other interventions.

Correct Answer: D

Rationale: The primary focus of treatment for a child diagnosed with a developmental disability should be to help them achieve their maximum potential. This approach aims to optimize the child's physical, emotional, cognitive, and social abilities, focusing on enhancing their overall well-being and quality of life. By supporting the child in reaching their highest level of functioning, caregivers can promote independence, self-esteem, and personal growth, which are essential components of holistic care for individuals with developmental disabilities.

Correct Answer: A

Rationale: Assessing the bilirubin level helps determine the severity of jaundice in the newborn.

Correct Answer: B

Rationale: Chorea, or sudden aimless movements associated with rheumatic fever, is temporary in nature and will eventually disappear on its own. It is important for the nurse to reassure the parents that these movements are part of the condition and typically resolve over time without the need for permanent lifestyle changes or strict discipline. Providing accurate information and reassurance to the parents can help alleviate concerns and promote understanding of the condition's course.

Correct Answer: D

Rationale: A vigorous cry upon stimulation indicates that the newborn has good respiratory effort and is transitioning well to life outside the womb. It shows that the infant's airways are clear, and they are able to establish effective breathing, a crucial aspect of transitioning successfully to extrauterine life.