A nurse is caring for a preterm newborn who is in an incubator to maintain a neutral thermal environment.The father of the newborn asks the nurse why this is necessary.Which of the following responses should the nurse make?

Preterm newborns lack the ability to regulate their own temperatures.

The heat in the incubator rapidly dries the sweat of preterm newborns.

Preterm newborns have a smaller body surface area than normal newborns.

The added brown fat layer in a preterm newborn reduces his ability to generate heat.