By early next year, parents of newborns at Boston Children’s Hospital and Brigham and Women’s Hospital will have the chance to participate in the first randomized study of the medical and ethical repercussions of sequencing the DNA of babies. Alan Beggs, the Sir Edwin and Lady Manton Professor of Pediatrics at Boston Children’s Hospital, co-leads the study with Robert Green, HMS associate professor of medicine at Brigham and Women’s Hospital.