An infant has just undergone surgical repair of a myelomeningocele. What is the priority nursing intervention to perform immediately following the procedure?

A. Maintain skin integrity → Important but not the priority immediately post-op. B. Position the infant supine → Incorrect; the infant should be positioned prone (on the abdomen) to prevent pressure on the surgical site. C. Monitor intake and output → Necessary but not the most urgent concern compared to hydrocephalus risk. D. Monitor head circumference → Infants with myelomeningocele are at high risk for hydrocephalus due to cerebrospinal fluid obstruction. Increased head circumference may indicate increased intracranial pressure (ICP).