If medically necessary they will do surgery and create a stoma for children even younger than 12. There are babies with stomas. Usually doctors treat Crohn's in pediatrics patients aggressively with medication so that hopefully surgery can be avoided. Clash, Maya and mylittlePenguin can give you greater detail if you have specific questions. Hopefully your little one can avoid surgery. If surgery is being recommended, it is always best to get a second opinion to ensure that surgery is necessary.