Mosaic Down syndrome, or mosaicism, is a rare form of Down syndrome. People with this form may have fewer symptoms of Down syndrome. Down syndrome is a genetic disorder that results in an extra copy ...

Down syndrome occurs when a baby develops an extra copy of the 21st chromosome during pregnancy, resulting in telltale symptoms. These distinctive signs and symptoms can include recognizable facial ...

Puerto Rico's Sofía Jirau became the first Victoria's Secret model with Down syndrome earlier this month – a welcome moment of disability inclusion. People with Down syndrome have an extra chromosome ...

Editor's note: This article was first published to mark World Down Syndrome Day in 2015. Marguerite (Maggie) Reardon is a senior writer at CNET, where she writes the "Ask Maggie" advice column, and a ...

A child born with this condition has extra genetic material caused by abnormal cell division. This results in an extra full or partial copy of chromosome 21. There are three types of Down syndrome, ...

Mosaic Down syndrome is a rare form of Down syndrome. People with mosaic Down syndrome only show extra chromosomes in some cells, as opposed to all their cells. Human DNA typically contains 23 pairs ...