When women get a blood test during pregnancy that looks at free-floating DNA, they expect it to tell about the health of the fetus. But the test sometimes finds signs of cancer in the mother.
Isabel Seliger for NPR
Kelly Kuhns's 2-year-old son Oliver was born with Down syndrome. She says that she was shocked when a prenatal test revealed a Trisomy 21 mutation. But, she says, "he's still a baby. He's still worthy of a life just like everybody else."