The harm of this x-ray is mainly the presence of radiation, because small children are in the growth and development stage, each organ is relatively fragile, especially the gonads and hematopoietic system, then may cause damage to these places, long-term exposure to radiation, increase the probability of leukemia and other problems. Therefore, small children and infants should avoid radiography as much as possible, and if they have to be photographed, they need to pay attention to the protection of the gonads. Of course, this is an occasional x-ray exposure, generally speaking, the probability of affecting the body is still very low.