This changes the way their brain and body develop. A person diagnosed with Down syndrome has an extra copy of chromosome 21, which means their cells contain 47 total chromosomes instead of 46. Most people have 23 pairs of chromosomes within each cell in their body, for a total of 46. What is Down syndrome?ĭown syndrome is a genetic condition where people are born with an extra chromosome. Physical signs become more apparent as your child grows. ![]() ![]() ![]() Down syndrome can affect how your child develops.
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