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The pattern of breathing of 18 preterm newborn infants weighing less than 1500 g. at birth, and old 35 full-term newborns weighing more than 2500 g. at birth were studied during the neonatal period. The newborns were grouped according to postnatal age. (less than 24 hrs; 24 hrs.-7 days and less than 7 days). The inspiratory and expiratory flow was measured… (More)