There are no mental or behavioral abnormalities, but people who have Down's Syndrome have rounded shoulders, a thicker skull, and a spongy tongue which causes speech impediment.
Below is a list of common physical traits of someone with Down syndrome.(Bear in mind that every person with Down syndrome is a unique individual and may possess these characteristics to different...
Down syndrome is a genetic condition that not only affects the brain but also affects physical appearance because of the genes affected by the disease. Sorry I don't know how exactly the genes are...