There is no authoritative information on how many times a newborn can have a chest X-ray in half a month. Usually, the radiation level of chest X-rays is within the permissible range, but it depends on the condition of the patient, and it is not possible to make a generalization. Chest X-rays are generally referred to as chest X-rays, which are formed by passing X-rays through the chest and projecting them onto a film. It can be used to examine the ribs, thoracic vertebrae, soft tissues, thoracic cavity, heart, etc., and provide the basis for clinical diagnosis. Chest radiographs have a certain amount of radiation, but they are less harmful and safer for half-month-old babies, so there is no need to worry too much. If a half-month-old baby has any physical abnormality, parents should bring the baby with them and ask the doctor for guidance according to the baby’s own condition. Chest X-ray examination within a manageable range, usually does not cause harm to the child’s body, do not need to worry too much. If the child shows obvious abnormal symptoms after the chest X-ray examination, parents should pay attention to it and go to a regular hospital for relevant examinations. In the daily life, we should ensure that the child has enough rest time.