An occasional CT in children has little effect on the body. If CT is done frequently, the main harm is caused by radiation. Long-term frequent CT will cause some damage to the human gonads, especially the testicles of male babies are one of the sensitive target organs of electromagnetic radiation, which is easy to produce some harm to the baby’s reproductive system. In addition, there will be children’s hematopoietic stem cells have a certain inhibitory effect, there will be a transient reduction of red blood cells, white blood cells. If the abdomen is exposed to a large amount of radiation, nausea, vomiting and other symptoms. Although there are certain hazards associated with CT examinations, it takes a long period of time and high doses of radiation exposure for the above adverse effects to occur. Children who undergo CT once in a while, or once or twice a year, are generally harmless and have little effect on their health. Since CT plays a very important role in the diagnosis of diseases, CT examinations should be viewed rationally and still need to be completed when necessary to avoid delaying the condition and jeopardizing the baby’s life.