Widening of the extracerebral space is not always due to developmental delay, but may be normal, or may be caused by brain dysplasia, brain atrophy, or subdural effusion. It is necessary to consult a doctor in time to clarify the cause according to the examination results and accompanying symptoms, and then to carry out targeted treatment. Common causes and treatments I. Normal conditions: If the infant is born, the development of the skull generally precedes the development of brain tissue, thus appearing in the imaging of brain gap widening performance, especially in premature infants, can generally disappear on its own, without special treatment. Second, abnormalities: 1, brain dysplasia: due to abnormal brain development. It can be treated mainly by surgery or rehabilitation training to treat the disease; 2. Brain atrophy: it can be caused by the shrinking of brain cell volume, causing symptoms such as confusion in thinking and memory loss. If it is cerebellar atrophy, it can manifest as dizziness, balance disorder and intentional tremor and other symptoms. The treatment can be done with drugs such as donepezil and ergometrine as prescribed by the doctor. 3. Subdural fluid: mainly due to cranial injury resulting in rupture of the arachnoid membrane, resulting in cerebrospinal fluid accumulation under the dura and causing brain tissue deformation. Asymptomatic patients are given observation and follow-up, and serious conditions can be treated by surgical methods such as borehole drainage and in vivo subdural-peritoneal diversion; 4. Delayed brain development: often manifests as delayed development of movement and language. Rehabilitation training can be carried out under the guidance of professional doctors to improve immunity and promote brain development. If the infant has widened extracerebral space, it should be reviewed at the age of about 2 years to see if it is gradually improving. If there is any abnormality, timely treatment is necessary to avoid delaying the condition.