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You have probably seen people who have Down syndrome. They have certain physical features, such as a flatter face, upward slanting eyes, and a somewhat larger tongue. They may have medical problems, too, such as heart defects. And they usually have some mental retardation, which means they may have trouble learning. But despite their challenges, kids with Down syndrome can go to regular schools, make friends, enjoy life, and get jobs when they're older.
To understand why Down syndrome happens, you need to understand a little about chromosomes. What's a chromosome? They are thread-like structures within each cell and are made up of genes. Genes provide the information that determines everything about people, from hair color to whether they are girls or boys.
Most people have 23 pairs of chromosomes, for a total of 46. But a baby with Down syndrome has an extra chromosome (47 instead of 46) or one chromosome has an extra part. This extra genetic material causes problems with the way their bodies develop.
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