Babies with large heads need accurate head circumference measurement, and if it is 20% outside the normal range, it is recommended to choose a regular hospital for further examination. The average head circumference of a newborn is 34cm; the head circumference grows fastest from 1 to 3 months, and can increase by 5-6cm, after which the growth rate gradually slows down; by the age of 1, the head circumference is about 46.0cm for boys and 45.5cm for girls. but it should be noted that the baby’s head circumference is only a statistical range, and a slight exceedance cannot determine that the baby is defective. Abnormal causes 1, hydrocephalus: hydrocephalus is the most common cause of increased head circumference in babies, related to genetic factors, intracranial hemorrhage or central nervous system infection, often manifested as forehead protrusion, eye down-turn, sclera exposure; 2, occupying lesions: such as pediatric brain tumors, mostly related to gene deletion or mutation, may be accompanied by headache, vomiting and optic papilledema; 3, macrocephaly: is a relatively rare genetic The disease is caused by glial cell overgrowth, which can be seen as long head deformity, huge hands and feet, pointed lower forehead, etc.; treatment methods 1, surgery: reduce cerebrospinal fluid secretion through surgery, remove the tumor as much as possible, and can be combined with radiotherapy and chemotherapy; 2, drug treatment: use mannitol, tachyphylaxis, dexamethasone as prescribed by the doctor, which can correct cerebral edema and reduce intracranial pressure; anti-infection treatment, such as penicillin.