Williams syndrome is a very complex birth defect that can have some or all of the following defects.
- Characteristic facial appearance
- Heart and blood vessel problems
- Hypercalcemia (elevated blood calcium levels)
- Low birth-weight / low weight gain
- Feeding problems
- Irritability (colic during infancy)
- Dental abnormalities
- Kidney abnormalities
- Hernias
- Hyperacusis (sensitive hearing)
- Musculoskeletal problems
- Overly friendly (excessively social) personality
- Developmental delay
- learning disabilities
- attention deficit