TY - JOUR T1 - Nomina sunt consequentia rerum: Time for a change in the definition of bronchiolitis? AU - Barbi E, Neri E, Ventura A Y1 - 2004/04/01 N1 - 10.1001/archpedi.158.4.403-a JO - Archives of Pediatrics & Adolescent Medicine SP - 403 EP - 403 VL - 158 IS - 4 N2 - The newborn's lungs move through important changes from birth to 2 years of age. The proper fetal period of lung development, with the end being the saccular stage, is close to 6 months of age, and the alveolar-arterial ratio of 20:1 in the newborn changes to 12:1 at 2 years of age, which is closer to the ratio for older children of 10:1. SN - 1072-4710 M3 - doi: 10.1001/archpedi.158.4.403-a UR - http://dx.doi.org/10.1001/archpedi.158.4.403-a ER -