How prevalent is the disorder in the population?

A baby’s chances of having DS increase as their mother’s age does. However, a woman of any age can produce a child with this disorder. For women around the age of 25, about one in every 1250 babies are born with Down’s Syndrome. For a woman around the age of 40, her baby’s chances of having DS increase to about 1 out of every 100.

       Here's a chart:

20	1 in 1,600
25	1 in 1,300
30	1 in 1,000
35	1 in 365
40	1 in 90
45	1 in 30