prenatal testing

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 hide caption

Shara and Robert Watkins hold their 5-month-old daughter, Kaiya, in their home in San Mateo, Calif., just after she had woken up from an afternoon nap. Lindsey Moore/KQED hide caption

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." Sarah McCammon/NPR hide caption