PVL often leads to nervous system and developmental problems in growing babies, usually during the first to second year of life. It may cause cerebral palsy (CP), especially tightness, or increased muscle tone (spasticity) in the legs.
Babies with PVL are at risk for major nervous system problems, especially involving movements such as sitting, crawling, walking, and moving the arms. These babies may need physical therapy.
A baby who is diagnosed with PVL should be monitored by a developmental pediatrician or a pediatric neurologist, in addition to the child's regular pediatrician.