One in every 800 to 1,000 children is born with the disorder.

In an autosomal recessive inheritance pattern, two defective copies of the gene (one inherited from each parent) are required in order for a child to be born with the disorder.

Some believe she may have been born with the disorder called Down syndrome but it has never been proved.

This means the defective gene is located on an autosome, and two copies of the gene-one from each parent-are required to be born with the disorder.

The lifetime medical and social costs of FAS are estimated to be as high as US$800,000 per child born with the disorder.

This mass of people, all of whom were either born with the disorder or are related to someone who was, is a geneticist's dream.

Each year, about 400 babies are born with the disorder.

Although Weber's syndrome is rare, a child born with the disorder typically has a port-wine stain on the face around the eye.

This means the defective gene responsible for the disorder is on an autosome, and two copies of the defective gene (one inherited from each parent) are required to be born with the disorder.

Their fourth, sixth and seventh children were also born with the disorder.