Infants with biliary atresia (Biliary atresia, BA) have an increased risk of malnutrition due to insufficient dietary intake to maintain normal growth, impaired intestinal absorption, increased metabolic rate, and damage to some liver macronutrient metabolic pathways. The medium-chain triglyceride formula (MCT) in enteral nutrition has advantages: (1) It has a fast metabolism in the liver and possesses the advantage of being an innate energy source; (2) It can share metabolic pathways with some other fatty acids (DHA, EPA), and can promote the synthesis of phospholipids, etc. Therefore, EN containing the MCT formula is regarded as an important approach to alleviate growth retardation in BA children and improve the nutritional status of patients. This study aims to observe the effect of intensified enteral feeding with a high MCT formula during the perioperative period compared to traditional oral feeding on the prognosis of children with biliary atresia. The method adopted is a prospective, two-arm, open-label, multicenter, and interventional real-world study.