the administration of a liquid formula diet with the exclusion of all other regular food for 8 weeks， the volume was determined according to the energy needs of the patient. All patients received high energy intakes (>110%-120% of the average requirement).

the participants with active CD accept anti-TNF therapy (Infliximab) at 0week, 2week, 6week, 14week. Infliximab, a monoclonal antibody-targeting tumor necrosis factor (TNF), is one of the primary treatment strategies for active pediatric CD

Infliximab, a monoclonal antibody-targeting tumor necrosis factor (TNF), is one of the primary treatment strategies for active pediatric CD

the mucosal healing was defined as Simple Endoscopic Score for CD （SES-CD ）≤4 at the end of treatment . For the SES-CD, the intestine is divided into 5 anatomic segments under the endoscopic vision: rectum, left side of the colon segment, transverse colon, right side of the colon segment, and ileum. Items of interest include ulcer size, estimates of the ulcerated and affected surface, and the presence of luminal narrowing. The SES-CD score is calculated by combining scores of individual segments. Overall SES-CD scores are classified into 4 disease categories: none, 0 to 2; mild 2 to 4; moderate 5 to 15; and severe>16.

the mucosal healing was defined as Simple Endoscopic Score for CD （SES-CD ）≤4 at the end of treatment . For the SES-CD, the intestine is divided into 5 anatomic segments under the endoscopic vision: rectum, left side of the colon segment, transverse colon, right side of the colon segment, and ileum. Items of interest include ulcer size, estimates of the ulcerated and affected surface, and the presence of luminal narrowing. The SES-CD score is calculated by combining scores of individual segments. Overall SES-CD scores are classified into 4 disease categories: none, 0 to 2; mild 2 to 4; moderate 5 to 15; and severe>16.