Crohn's disease is a long-term condition caused by inflammation in the gut, and so is a type of inflammatory bowel disease (IBD). This damages the digestive system and causes episodes of symptoms, known as flare-ups, but your child will likely also have long periods without symptoms, known as remission.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/crohns-disease-in-children-how-to-support-your-child