Perri Klass, MD, FAAP, writes the weekly column, "The Checkup," for The New York Times. She lives in New York City. Eileen Costello, MD, FAAP, is a clinical professor of pediatrics at Boston University School of Medicine. She lives in Jamaica Plain, MA.
Perri Klass, MD, FAAP, writes the weekly column, "The Checkup," for The New York Times. She lives in New York City. Eileen Costello, MD, FAAP, is a clinical professor of pediatrics at Boston University School of Medicine. She lives in Jamaica Plain, MA.