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 formula-fed newborns typically have one or more stools per day, not every 3 days. Stooling less frequently than once a day may indicate constipation.

Choice B reason:

This is correct because breastfed newborns usually have two to three stools per day, which are soft and yellow. Breastfed babies may also have stools less frequently, even once every 10-14 days, as long as the stool is soft.

Choice C reason:

This is incorrect because newborns should be fed formula on demand, not on a strict schedule. The average feeding interval for formula-fed newborns is about 3 to 4 hours.

Choice D reason:

This is incorrect because newborns should be breastfed eight to 12 times per day, not five to seven times. Breastfeeding more frequently helps to establish milk supply and prevent engorgement. - Stanford Medicine.

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.