Medically reviewed by Nicholas R. Metrus, MD Key Takeaways Mosaic Down syndrome has some cells with three copies of chromosome 21, and some with two instead of all three.Only about 1% to 2% of people ...

If you’ve been told that your growing baby has “soft markers” for Down syndrome, you likely have many concerns. What do these soft markers mean? What’s the likelihood that your child will be born with ...

Down syndrome is a genetic disorder caused by an extra copy of chromosome 21. Along with causing intellectual disability and physical health issues, this condition may make a person more prone to ...