Rotarix may cause an intestinal problem called intussusception 腸套叠 (in-tuh-suh-SEP-shun) in some people. Intussusception is when a section of the intestine folds over into itself, creating an obstruction in the bowel. Call your doctor as soon as possible if your child has stomach pain or bloating, vomiting (especially if it is golden-brown to green in color), bloody stools, grunting or excessive crying, and eventually weakness and shallow breathing.