title: In Reply.
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston, Massachusetts.
authors.forename: Blair
authors.initials: B
authors.lastname: Wylie
authors.affiliation: Boston Children's Hospital, Boston, Massachusetts.
authors.forename: Marissa
authors.initials: M
authors.lastname: Hauptman
authors.affiliation: Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston Children's Hospital, Boston, Massachusetts.
authors.forename: Alan D
authors.initials: AD
authors.lastname: Woolf
authors.affiliation: Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston Children's Hospital, Boston, Massachusetts.
authors.forename: Rose H
authors.initials: RH
authors.lastname: Goldman