Excision has been widely recognized as the treatment of choice for choledochal cysts. For biliary reconstruction after cyst excision, we have strongly recommended hepaticoenterostomy at the hepatic hilum with a wide anastomotic stoma to prevent postoperative cholangitis. However, we recently treated two infants in whom a wide anastomotic stoma could not be made due to a narrow hilar duct. Therefore, a hepatic portojejunostomy with Roux-en-Y anastomosis (Kasai's procedure) was performed after cyst excision in both case to permit free drainage of bile. The mucosa of the hilar duct was everted and fixed to the liver parenchyma to prevent stricture formation. Both babies have done well since the surgery.