Five-month-old baby did a brain CT radiation is large generally do not have to be overly nervous, generally will not affect the baby’s health. Although the brain CT examination has a certain amount of radiation, but the radiation is not very large, generally on the baby’s body basically will not have adverse effects, so do not have to worry too much. An occasional CT scan of the brain uses a small dose, and within a limited range will not affect the normal growth and development of the baby. A healthy five-month-old baby should not have frequent brain CT examinations, as frequent brain CT examinations may lead to higher radiation, which may have a greater impact on the baby’s body. However, if it is necessary for the baby’s condition, the CT examination needs to be conducted under the guidance of the doctor.