Malnutrition is common in critically ill children.Nutrition prescription is hampered by various factors,and the nutritional status of these children often deteriorates during hospitalization.Nutrition therapy for critically ill children must be based on proper nutrition screening and nutritional assessment.Adopting dynamic nutritional assessment is an effective method to monitor patients under nutrition therapy and inform the prescription and administration of nutrition therapy.This article reviews the recent advances in nutrition screening and nutritional assessment in critically ill children.