What is Down syndrome?

Down syndrome is a genetic disorder caused by an extra chromosome number 21. It's named after the doctor who discovered its cause.

 

How is Down syndrome diagnosed?

Tests can be done before birth to find out if a baby has Down syndrome. Tissue and fluid in the womb around the baby can be checked for the extra chromosome. After birth, if the baby has any of the physical signs or birth defects of Down syndrome, the baby's blood can be tested to check for the extra chromosome.