A new born child developed respiratory depression in neonatal ward. Which of the following drug is the cause

Opioids like fentanyl, codeine, pethidine, morphine causes respiratory distress in neonates. Epidural opioid analgesia is commonly employed as a therapeutic modality in the management of pain during labor and can cause neonatal respiratory depression. Reference : page 740 Ghai Essential Pediatrics 8th edition