Final answer:
The nurse should monitor the newborn for a scalp hematoma.
Step-by-step explanation:
A nurse who is admitting a newborn to the nursery observes a fetal scalp monitor site on the scalp. The complication the nurse should monitor for in this newborn is d) Scalp hematoma. A scalp hematoma is a collection of blood underneath the scalp, usually caused by trauma during birth. This can lead to swelling and increased pressure in the area, and in severe cases, may require medical intervention to prevent further complications.