Down syndrome is a condition in which extra genetic material causes delays in the way a child develops, both physically and mentally. ... What Causes It? ... How Down Syndrome Affects Kids

You have probably seen people who have Down syndrome. They have certain physical features, such as a flatter face ... This extra genetic material causes problems with the way their bodies develop

Down syndrome symptoms vary from person to person and can range from mild to severe. However, children with Down syndrome have a widely recognized appearance.

Review some of the causes of Down syndrome, including advanced maternal age. ... What are the causes of Down Syndrome?

Alzheimer's Disease and Down Syndrome ... What is Down syndrome? ... How is Down syndrome associated with Alzheimer's disease?

A description of Trisomy 21 (Down syndrome) by Len Leshin, M.D., F.A.A.P. ... In the first part of the twentieth century, there was much speculation of the cause of Down syndrome.

The simplest answer to your question is...we don't know for sure what gene(s) causes Down syndrome.But here's some background and some speculation...

The Chromosomal Basis of Down Syndrome ... Detecting Hearing Loss in Children - Read about tests used for identifying hearing loss in children, treatment information, causes, risk factors and signs

Down syndrome — Comprehensive overview covers causes, risk factors and diagnosis of this genetic disorder. ... Trisomy 21. More than 90 percent of cases of Down syndrome are caused by trisomy 21.

National Down Syndrome Society benefits people with Down syndrome and their families through national leadership in education. This is the number one site for information and Down syndrome.