Down syndrome is a set of cognitive and physical symptoms that result from having an extra chromosome 21 or an extra piece of that chromosome. It is the most common chromosomal cause of รขโ‚ฌยฆ Nichd offers and links to information to help parents, families, and providers better understand down syndrome and its effects and receive support.

As the registry grows, families and researchers learn more about down syndrome and identify similarities and differences in the symptoms and treatment of people with down syndrome from รขโ‚ฌยฆ