Final answer:
When the nurse notes that the anterior fontanel bulges when the infant cries, it is a sign of increased intracranial pressure (ICP). The appropriate action for the nurse to take is to report the finding to the healthcare provider.
Step-by-step explanation:
When the nurse notes that the anterior fontanel bulges when the infant cries, it is a sign of increased intracranial pressure (ICP). Increased ICP can be a serious condition that requires medical attention. Therefore, the appropriate action for the nurse to take is to report the finding to the healthcare provider so that further assessment and intervention can be done if necessary.