Final answer:
The nurse would suspect an increase in intracranial pressure in the 6-month-old infant exhibiting irritability, bulging fontanels, and sun-setting eyes.
Step-by-step explanation:
The nurse would suspect an increase in intracranial pressure in the 6-month-old infant exhibiting irritability, bulging fontanels, and sun-setting eyes. An increase in intracranial pressure is a condition where there is an abnormal build-up of pressure inside the skull. It can be caused by various factors such as head trauma, brain infections, or swelling of the brain or meninges.
These symptoms can be indicative of a serious condition and require immediate medical attention. It is important for the nurse to closely monitor the infant and notify the healthcare provider for further evaluation and treatment.