Williams syndrome is a genetic disorder that was first recognized as a distinct entity in 1961. It is present at birth, and affects males and females equally. It can occur in all ethnic groups and has been identified in countries throughout the world. Characteristic facial appearance Most young children with Williams syndrome are described as having similar facial features.
Facial features become more apparent with age.
The majority of individuals with Williams syndrome have some type of heart or blood vessel problem. Since there is an increased risk for development of blood vessel narrowing or high blood pressure over time, periodic monitoring of cardiac status is necessary. Some young children with Williams syndrome have elevations in their blood calcium level. The true frequency and cause of this problem is unknown. Occasionally, dietary or medical treatment is needed.