Fetal alcohol syndrome (FAS) and Down syndrome are both conditions that are present at birth. While they both affect facial appearance, development, and physical health, they have different causes.

Emma McLean is a 6-year-old girl who loves Taylor Swift, reading books, playing the drums and hanging with her little sister. While Emma has Down syndrome — specifically a rare type called Mosaic Down ...

Decades ago, researchers showed that Down syndrome (also known as trisomy 21), was caused when individuals carried an extra copy of chromosome 21. Down syndrome is also the most common genetic cause ...