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D o w n s     S y n d r o m e
W e b   P a g e
Down syndrome is a genetic disorder that results in varying degrees of physical and mental retardation.
The condition varies in severity, causing developmental problems that range from mild to severe. The disorder occurs as a result of extra genetic material.

In most people, the genes are contained on 23 pairs of chromosomes, for a total of 46 chromosomes. Most people with Down syndrome have an extra copy of the No. 21 chromosome, for a total of 47 chromosomes.

Down syndrome is the most common chromosomal disorder. An estimated 1 in 800 infants are born with Down syndrome. Down syndrome is also a common cause of miscarriage. Every year, as many as 5,000 babies are born with Down syndrome in the United States.

Every year, one child in every 800 to 1,000 births will be born with a condition known as Down syndrome. Down syndrome is a disorder in which the child has extra genetic material. This extra genetic material causes the baby to develop differently in the womb. This abnormal development occurs during the early stages of cell division, soon after conception.
 
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