People with Down syndrome tend to have certain physical features in common. For example, they often have flat noses and small ears.<br><br>Their mental abilities will vary, but most have mild to moderate issues with thinking, reasoning, and understanding. They'll learn and pick up new skills their whole lives, but may take longer to reach important goals like walking, talking, and developing social skills.<br><br>Many people with Down syndrome don't have any other health issues, but some do. Common conditions include heart problems and trouble hearing and seeing.<br><br>Causes<br>Normally, each cell in your body has 23 pairs of chromosomes. One PH' chromosome in each pair comes from your mother. The other comes from your father.<br><br>But with Down syndrome, something goes wrong and you get an extra copy of PH' chromosome 21. That means you have three copies instead of two, which leads to the signs and symptoms of Down syndrome. Doctors aren't sure why this happens. There's no link to anything in the environment or anything the parents did or didn't do.
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