Mary Harris was relieved when Stella was born with a mop of thick black hair, as if she had been protected from the chemo somehow. Howard Harris hide caption

itoggle caption Howard Harris

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

itoggle caption iStockphoto

A woman enters the Ebola treatment center at the Island Hospital outside of Monrovia, Liberia, Oct. 6. She said she was bleeding heavily from a miscarriage and was turned away from other clinics in the city. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

A healthy baby still tops women's wishes for their future children, but intelligence and athletic skill are gaining importance. Claire Fraser/ImageZoo/Corbis hide caption

itoggle caption Claire Fraser/ImageZoo/Corbis

Nurse midwife Danielle Kraessig seen meeting with Yakini Branch at the PCC South Family Health Center in Berwyn, Ill., in early 2013. While the federal law requires insurers to cover maternity services, birthing centers and midwifery services aren't always included. M. Spencer Green/AP hide caption

itoggle caption M. Spencer Green/AP

Up till now, all babies have had two genetic parents. That could soon change. Klöpper & Eisenschmidt GbR/iStockphoto hide caption

itoggle caption Klöpper & Eisenschmidt GbR/iStockphoto

Governor Deval Patrick of Massachusetts signed the law enacting the state's latest phase of health care on August 6, 2012. Eric Haynes/Governor Deval Patrick's Office hide caption

itoggle caption Eric Haynes/Governor Deval Patrick's Office