A nurse in a clinic is assessing a 9-month-old infant. Which of the following findings requires further intervention?

A. Negative Doll's eye reflex: By 9 months, the doll's eye reflex (in which the eyes move in the opposite direction of the head) should no longer be present. Its absence is normal and does not require intervention. B. Negative Crawl reflex: The crawling reflex typically fades by 6 weeks and is replaced by voluntary movements by this age. A negative crawl reflex at 9 months is expected and does not warrant concern. C. Positive Babinski reflex: A positive Babinski reflex is considered normal in infants up to about 12 months. It involves dorsiflexion of the big toe when the sole is stroked and does not require intervention in a 9-month-old. D. Positive Moro reflex: The Moro reflex (startle reflex) typically disappears by 4 months of age. Its persistence at 9 months may indicate neurological immaturity or dysfunction and requires further evaluation.