Clinical manifestations of neonatal hydrocephalus: 1. The head circumference of the newborn increases rapidly after birth, the head becomes round, the subcutaneous veins become angry, the fontanelle enlarges and bulges, the tension is high, and the fontanelle does not fall when the child is placed in an upright position; 2. The cranial suture does open, the head becomes thin, the skull becomes round, and the enlargement of the head is mainly seen in the upper part of the cerebellar curtain, and the occlusion in the exit part of the four ventricles is mostly seen in the enlargement of the posterior cranial fossa. The normal value of head circumference of newborns after birth is 33-35 cm, and it increases by 1.2-1.3 cm every month within 6 months, totaling 8 cm, 3 cm in the second half of the year, 2 cm in the second year, 2 cm in the third and fourth years, and 1.5 cm in the next 6 years. posterior fontanelle generally closes at 6 months, and anterior fontanelle generally closes at 9-18 months. In infants and young children, hydrocephalus mostly starts to increase in size a few days after birth, and is usually found gradually at 3-5 months of age. Sometimes the head is enlarged at birth, and when the head is abnormal due to increased intracranial pressure, it is disproportionate to the surrounding neurological development, the frontal area is relatively prominent, the orbits are sunken, both eyes are downward looking, the eyes are turned downward, the fontanelle is enlarged and the tension is increased, other fontanelles are enlarged, the cranial sutures are separated, the scalp veins are varicose, and the head is percussed with a “broken can sound “etc.; 3. Severe cerebrospinal fluid patients with faster development of the disease may also have recurrent vomiting, degenerative brain changes, brain developmental disorders, central paralysis of the limbs, with the lower limbs being the most important, often accompanied by mental retardation or developmental disorders, optic nerve compression and atrophy may lead to blindness, nystagmus, convulsions, etc.