Post - Marketing Case Registration Study on the Safety and Efficacy of Adalimumab Solution for Injection in Chinese Pediatric Patients With Moderate - to - Severe Active Crohn's Disease

Inclusion Criteria: * Age is between 6 years old (inclusive) and 17 years old (inclusive), regardless of gender. * Diagnosed as having moderate - to - severe active pediatric Crohn's disease according to the "Expert Consensus on the Diagnosis and Treatment of Pediatric Inflammatory Bowel Disease 2019". * (3) Pediatric Crohn's disease patients who have been prescribed Adalimumab Solution for Injection by doctors after a full assessment of risks/benefits.Both the patient and their guardian must sign the informed consent form. The research protocol/informed consent form used for data collection and data verification should comply with local laws and regulatory requirements. Exclusion Criteria: * (1) According to the instruction manual of Adalimumab Solution for Injection and the judgment of the treating physician, the patient is not suitable for treatment with Adalimumab Solution for Injection. * (2) Pediatric Crohn's disease patients who have received any live vaccines within 3 months prior to the first dose of Adalimumab Solution for Injection or who plan to receive any live vaccines during the study period. * Patients who are participating in other clinical studies. (4) Patients whom the investigator deems unsuitable for participation in this trial.