Is crohn disease contagious, how common is it in babies?

Crohn's disease: This is not a communicable condition, as far we understand it. Its etiology has been attributed to colonization of the gut with different organisms (a british doctor thinks a tb-like bacillus) and an abnormal host immune response to these. 20% of cases occur in children, but the youngest are in the range of 7-8 years, and often in families with adult crohns, suggesting hereditary component.