Risk Stratification of Rapid Disease Progression in Children With Crohn's Disease

Inclusion Criteria: * Males and females younger than 17 years of age (before their 17th birthday). An upper limit of 17 years of age was selected as important inclusion criteria to maximize the number of potential subjects that would be diagnosed and followed by a pediatric gastroenterologist for at least 3 years. * Confirmed or suspected diagnosis of Crohn's disease based on standardized diagnostic criteria. The enrollment should occur within 30 days of diagnosis. * Able to provide written informed consent or the ability to obtain written informed consent from the parents or patient's legal guardian in conjunction with youth assent. * Consented to have specimens tested for genetics and immune responses. * Access to follow-up data for a minimum of 36 months after diagnosis. * Final eligibility will be determined by the health professionals conducting this clinical trial. Exclusion Criteria: * Infectious colitis. * Final eligibility will be determined by the health professionals conducting this clinical trial.