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	To the National Down Syndrome Society For Registered Walk Organizers User ID Password Forgot your password?     Home About NDSS Research Information Topics National Policy Center News Events   About the Buddy Walks   Home   About the Buddy Walks   Press Room   Down Syndrome Facts Down Syndrome Facts Down syndrome occurs when an individual has three, rather than two, copies of the 21st chromosome. This additional genetic material alters the course of development and causes the characteristics associated with Down syndrome. Down syndrome is the most commonly occurring chromosomal abnormality. One in every 800 to 1,000 babies is born with Down syndrome. There are more than 350,000 people living with Down syndrome in the United States. Down syndrome affects people of all ages, races and economic levels. The incidence of births of children with Down syndrome increases with the age of the mother. But due to higher fertility rates in younger women, 80 percent of children with Down syndrome are born to women under 35 years of age. People with Down syndrome have an increased risk for certain medical conditions such as congenital heart defects, respiratory and hearing problems, Alzheimer's disease, childhood leukemia, and thyroid conditions. Many of these conditions are now treatable, so most people with Down syndrome lead healthy lives. Life expectancy for people with Down syndrome has increased dramatically in recent decades - from 25 in 1983 to 56 today. All people with Down syndrome experience cognitive delays, but the effect is usually mild to moderate and is not indicative of the many strengths and talents that each individual possesses. Quality educational programs, a stimulating home environment, good health care, and positive support from family, friends and the community enable people with Down syndrome to develop their full potential and lead fulfilling lives. People with Down syndrome attend school, find work, participate in decisions that affect them, and contribute to society. Researchers are making great strides in identifying the genes on Chromosome 21 that cause the characteristics of Down syndrome. Many feel strongly that it will be possible to improve, correct or prevent many of the problems associated with Down syndrome in the future       Privacy Policy Policies and Procedures Contact Us Terms of Use © 1995 - 2004 National Down Syndrome Society (800) 221-4602, www.ndss.org