This document discusses neonatal cholestasis. It defines neonatal cholestasis and provides the incidence. The causes are classified as intrahepatic or extrahepatic. Common intrahepatic etiologies include idiopathic neonatal hepatitis, genetic disorders, infections, and metabolic diseases. Extrahepatic causes include biliary atresia and choledochal cyst. Evaluation involves history, physical exam, lab tests, imaging like ultrasound and HIDA scan, and potentially liver biopsy. Treatment depends on the underlying cause but may include nutritional support, medications, surgery like Kasai procedure, or liver transplantation.