An occasional chest X-ray in a one-and-a-half year old child can cause damage to a very small number of cells, but the body is able to recover on its own, so the harm to the body is negligible. Chest X-ray is called fluorescence fluoroscopy, which is a kind of auxiliary examination means that utilizes the penetrating, fluorescence and photographic effects of X-ray to make human body structures form images on the screen. Chest X-ray is an auxiliary means of examination, which is an important reference for doctors to diagnose and treat diseases. Chest X-ray radiation is greater than chest X-ray, and its clinical application has been less. However, children need to do chest X-ray once in a while for the auxiliary diagnosis of diseases, there may be a very small amount of cell damage, but almost negligible, the damage to the body is extremely small, will not increase the incidence of leukemia, bone tumors and other oncological diseases, parents do not need to worry too much.