How common is Down syndrome?

According to the U.S. Centers for Disease Control and Prevention (CDC), approximately one in every 700 babies in the United States is born with Down syndrome, making Down syndrome the most common chromosomal condition.

This content originally appeared on the National Down Syndrome Society website.
Approximately 1 in every 1000 children born worldwide has Down Syndrome. Many of these children die early due to complications of the syndrome, such as congenital heart defects. In 2008, researchers estimated there were 250,000 people in the United States living with Down Syndrome. This translates to about 8 persons per 10,000.

Chances are you have probably heard of Down syndrome before and may even know a person with it. Today, one baby out of 800 or so is born with Down syndrome. And about 250,000 families living in the United States have a member with the genetic disorder.

Continue Learning about Down Syndrome

Down Syndrome

Down Syndrome

Down syndrome, or trisomy 21, is caused by the presence of a third copy of chromosome 21. The risk for Down syndrome is higher in babies of mothers older than 35, who are more likely to have abnormal eggs that may lead to the cond...

ition. Common symptoms include problems in growth, hearing, vision and immunity, along with problems of the thyroid, heart, muscles and nerves. The severity of these symptoms varies from person to person.

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.