THE term transient tachypnoea of the newborn (T.T.N.) was first used by Avery in 1966 to describe a condition characterised by a rapid respiratory rate during the first hours of life, with few or no accompanying signs of respiratory distress. Since then many authors have written about this syndrome under a variety of titles"Neonatal Tachypnoea" (Malan 1966), "Transient Respiratory Distress of t...