Down syndrome occurs when a baby is born with an extra chromosome 21. Read on to find out the screening, diagnosis, and types of Down syndrome.
Down syndrome: MedlinePlus Genetics
What is Down Syndrome? - Quora
About Down Syndrome National Down Syndrome Society (NDSS)
A closer look at the physical characteristics of Down syndrome
About Down Syndrome National Down Syndrome Society (NDSS)
Genetic conditions: Down's syndrome
Facts about Down Syndrome
Types of Down Syndrome
What to Know About Down Syndrome: Causes to Symptoms
Down Syndrome: Overview and More
Down syndrome Nature Reviews Disease Primers
11 Facts About Down Syndrome
Down syndrome - Wikipedia