Edith Bracho-Sanchez, an assistant professor of pediatrics at Columbia University, told "GMA" that this happens when the devices are used for things like unsupervised naps or soothing.

“There was a eureka moment when Peter and I realized that these dMyc mutant cells would disappear,” says [Laura] Johnston, now a developmental biologist at Columbia University in New York City.

Study co-author Dr. Elizabeth Oelsner, an internist at Columbia University Irving Medical Center, says the finding should dissuade people from taking up any amount of smoking.

“On a year to year basis, the safety and effectiveness of fertility treatments are just getting better,” says S. Zev Williams, MD, PhD, at Columbia University Irving Medical Center.