Background: Congenital hydrocephalus is a type of hydrocephalus that a child is born with, and this hydrocephalus can develop with age in children and adults as well. Congenital hydrocephalus may occur due to: Complex interactions between genetic factors and environmental factors during fetal development during pregnancy. The signs and symptoms of hydrocephalus vary somewhat with age. In newborns (0 to 2 months) Abnormal head growth, thinning of the scalp and veins in the head becoming more prominent, vomiting, restlessness, eyes fixed downward (sign of sunset) or seizures, or inability to communicate.