The newborn diagnosed with phenylketonuria (PKU) will require long-term follow-up to assess for the development of:

Choice A reason:

This is incorrect because TTN usually resolves within 24 to 72 hours of birth and does not require a long stay in the NICU.

Choice B reason:

This is correct because TTN is more common in babies born by cesarean section without labor, as they do not have the hormonal changes that help clear the fetal lung fluid.

Choice C reason:

This is incorrect because breastfeeding is not contraindicated in babies with TTN, unless they have severe respiratory distress or need continuous positive airway pressure (CPAP) support.

Choice D reason:

This is incorrect because TTN does not cause chronic lung disease or require oxygen therapy at home. Most babies with TTN only need supplemental oxygen for a few days until their breathing improves.

Choice A reason:

Heat facilitates the drainage of mucus for a premature newborn. This is incorrect because heat does not affect mucus drainage. Mucus drainage is more related to suctioning and hydration.

Choice B reason:

The newborn has a small body surface for his weight. This is incorrect because a small body surface area for weight would indicate a large newborn, not a premature one. A large newborn would have less risk of heat loss than a small one.

Choice C reason:

The newborn's temperature control mechanism is immature. This is correct because premature newborns have immature thermoregulation and are prone to hypothermia. Placing the newborn in an incubator helps maintain a stable temperature and prevent further complications.

Choice D reason:

Heat increases the flow of oxygen to the newborn's extremities. This is incorrect because heat does not directly affect oxygen delivery. Oxygen delivery is more related to ventilation, perfusion, and hemoglobin levels. The question is about a premature newborn who has signs of respiratory distress, such as nasal flaring, intercostal retractions, expiratory grunting, and mild cyanosis. These signs indicate that the newborn is having difficulty breathing and may have a condition such as respiratory distress syndrome, transient tachypnea of the newborn, or meconium aspiration syndrome. The nurse should place the newborn in an incubator to provide warmth and prevent heat loss, which can worsen respiratory distress. The nurse should also monitor the newborn's vital signs, oxygen saturation, blood gases, chest x-ray, and neonatal abstinence scoring system if indicated. The nurse should be prepared to administer oxygen, surfactant, or mechanical ventilation as ordered.