Alyssa Smith readjusts Desiree Andrews' hair as they cheer for the seventh grade basketball team at Lincoln Middle School on Monday in Kenosha, Wis. The gym has been dubbed "D's House" in Desiree's honor. Kevin Poirier/Kenosha News/AP hide caption

itoggle caption Kevin Poirier/Kenosha News/AP

Ultrasound is often used for prenatal screening. It's just one of several prenatal screenings available to pregnant women. iStockphoto hide caption

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Justin McCowan poses for a portrait outside of his house in Santa Monica, Calif., on Aug. 14. Benjamin B. Morris for NPR hide caption

itoggle caption Benjamin B. Morris for NPR

Justin McCowan, 39, has Down syndrome and lives at home with his parents in Santa Monica, Calif. Benjamin B. Morris for NPR hide caption

itoggle caption Benjamin B. Morris for NPR

The new test scans a mother's blood for bits of a fetus's DNA. iStockphoto hide caption

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