Final answer:
The most appropriate nursing diagnosis for a newborn with a pronounced cephalic hematoma is 'Parental anxiety related to knowledge deficit'. The care plan should focus on educating the parents about the condition to alleviate their concerns.
Step-by-step explanation:
A newborn with a pronounced cephalic hematoma following a posterior position birth is likely to bring up concerns for the infant as well as the parents. Given the options provided, the most fitting nursing diagnosis to guide the care plan would be C) Parental anxiety related to knowledge deficit. Cephalic hematoma is a condition where a collection of blood, known as a hematoma, forms beneath the skin in the newborn's head. While such a hematoma typically resolves on its own without causing brain damage, it can be distressing for parents to observe.
Providing clear information to the parents about the nature of the hematoma, its typical course, and what to monitor for in terms of complications can greatly alleviate their anxiety. Parental anxiety can impact the care the newborn receives, and addressing it is a critical piece of the newborn's overall plan of care.