Down syndrome.

First, Down syndrome will occur if you have extra 21 st chromosome , structure of DNA that show what you look like. Sound, Normally human will have 21 st chromosome one pair. A person who has down syndrome can feature by unusually round face, almond eyes shape, and their IQ is lower than normal people. Next, patient have problem with slow development such as slow walk and speaking slow. Nowadays , there is no how to cure it. Anyway they can prevent by check parents chromosome before kids born. specially pregnant women who is 35 years old and higher. Finally, we can give patient an chance to help them have a normal life.