The main cause of microcephaly is due to premature closure of the skull suture. Once the premature closure of the skull suture occurs, it is important to seek medical attention, make a timely diagnosis and do relevant treatment. Because once the premature closure of the cranial suture leads to small head deformity, clinically called narrow skull syndrome, it will affect the development of brain tissue and eventually affect the child’s intelligence. Once the child’s head is found to be smaller than other normal children, go to the hospital to do the relevant examination to clarify whether there is a problem, you can do the relevant CT, nuclear magnetic examination, etc., to see whether there is premature closure of the cranial suture, there is no abnormal situation. If there is an abnormality, the cause should be clearly identified, and the cause should be diagnosed in time to give relevant treatment to avoid major problems that may affect intelligence in the future.