Celiac disease is more common among children born in the spring and summer months, according to a new study from the Massachusetts General Hospital for Children. The findings suggest that the higher incidence of this autoimmune disease may be related to a combination of seasonal and environmental factors. Celiac disease is a digestive disorder triggered by consuming the protein gluten, which is primarily found in bread and other foods containing wheat, barley or rye. It can damage the small intestine and make it difficult to absorb certain nutrients, causing problems ranging from abdominal pain to nerve damage.