1. From the Division of Neonatology (F.d.J., R.M.v.E.), Department of Pediatrics, VU University Medical Center, Amsterdam, The Netherlands; Divisions of Emergency Medicine (M.C.M.) and Newborn Medicine (M.B.B.), Children's Hospital Boston, Boston, MA; Obesity Prevention Program (M.W.G.), Department of Population Medicine, Harvard Medical School/Harvard Pilgrim Health Care Institute, Boston, MA.