Hosp Pediatr. 2026 Jul 17:e2025009094. doi: 10.1542/hpeds.2025-009094. Online ahead of print. ABSTRACT BACKGROUND: Illicitly manufactured fentanyl (IMF) is the predominant opioid in the US drug supply and is a major contributor to morbidity and mortality during pregnancy. While prenatal opioid exposure is an established risk factor for neonatal opioid withdrawal syndrome (NOWS), the differential effects […]