A parent brings a 12-month-old child diagnosed with congenital cerebral palsy to the clinic. The nurse completes an assessment. Which assessment finding does the nurse determine needs immediate intervention?

A. Babbling is appropriate at this developmental stage. B. Failure to thrive can indicate poor nutrition or other health issues requiring urgent intervention. C. Sitting with assistance is common in cerebral palsy at this age. D. Spastic movements are common with cerebral palsy and do not require immediate intervention unless they worsen.