Final answer:
The nurse should monitor the infant closely for any complications associated with macrosomia.
Step-by-step explanation:
A macrosomic infant is born after a difficult, forcep-assisted delivery. After stabilization, the infant is weighed at 9 lb 6 oz. The nurse's most appropriate action would be to monitor the infant closely. Macrosomia refers to a baby that is significantly larger than average. It can be associated with complications such as birth injuries, respiratory problems, and low blood sugar. By closely monitoring the infant, the nurse can ensure early detection and intervention if any complications arise.