The National Down Syndrome Society released the following list of “Myths
& Truths About Down Syndrome”:

Myth: Down syndrome is a rare genetic disorder.

Truth: Down syndrome is the most commonly occurring genetic condition.
One in every 733 live births is a child with Down syndrome, representing
approximately 5,000 births per year in the United States alone. Today,
more than 400,000 people in the United States have Down syndrome.

Myth: People with Down syndrome have a short life span.