A two-month-old infant has undergone a major surgical procedure. Regarding postoperative pain relief which one of the following is recommended:

• A. Spinal narcotics via intrathecal route
• B. Intravenous narcotic infusion is lower dosage
• C. No medication is needed as infant does not feel pain after surgery due to immaturity of nervous system
• D. Only paracetamol suppository is adequate