Correct Answer: A

Rationale: The correct answer is A: Transition from fetal to neonatal breathing. The most critical physiological change required of newborns at birth is the initiation of breathing. This transition is crucial for the newborn to start exchanging oxygen and carbon dioxide outside the womb, marking the beginning of their independent respiratory function. Choices B, C, and D are important aspects of newborn care but are not as immediately critical as the establishment of breathing for oxygenation and removal of carbon dioxide, which is essential for the newborn's survival and adaptation to extrauterine life.

Correct Answer: D

Rationale: The FLACC Behavioral Pain Assessment Scale is the most suitable tool for assessing pain in 2-year-old children postoperatively. It assesses pain by evaluating facial expression, leg movement, activity, cry, and consolability, making it effective for non-verbal children. The Poker chip tool is not appropriate for this age group. The Oucher Scale and Faces Pain Rating Scale are more suitable for older children who can self-report pain levels.

Correct Answer: C

Rationale: A BMI-for-age at the 85th percentile indicates a child is at risk for being overweight, according to the National Center for Health Statistics criteria.

Correct Answer: A

Rationale: Engaging the infant in a familiar game like peek-a-boo can help reduce fear and build rapport before starting the assessment.

Correct Answer: D

Rationale: Accidents, such as motor vehicle accidents, drowning, and falls, are the primary cause of death in children over 1 year of age. While congenital anomalies can be a significant cause of mortality in infants, they are less common in older children. Homicide and suicide are serious issues but are not as prevalent as accidents in causing death among children over 1 year of age.