National Down Syndrome Awareness Month–1 of 21

Let’s start at the beginning.

• Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21.
• One in every 691 babies in the United States is born with Down syndrome.
• There are three types of Down syndrome: trisomy 21 (nondisjunction) accounts for 95% of cases, translocation accounts for about 4%, and mosaicism accounts for about 1%.
• Down syndrome is the most commonly occurring chromosomal condition.
• Down syndrome occurs in people of all races and economic levels.

(Source: NDSS)