Perri Klass, M.D., and Eileen Costello, M.D., are pediatricians on the staff of Boston University School of Medicine. Both Harvard graduates who trained in pediatrics at Boston Medical Center and Boston Children's Hospital, they have practiced pediatrics together at Dorchester House, a community health center in Boston, for ten years. Klass writes frequently for "The "New York Times, and is a contributing editor at "Parenting. She has written both fiction and nonfiction, including the novel "Other Women's Children and the memoir "Baby Doctor: A Pediatrician's Training. Each is the mother of th...