Causes of 'delayed' respiratory distress in infancy.

There are many causes of respiratory distress staring more than one week 
after birth in infants who have had no, or only transient 
and minor, respiratory problems immediately after birth. They may be divided 
into two broad groups: those with primary pulmonary pathology and those 
with extrapulmonary pathology with secondary effects on lung expansion. The former 
category includes Wilson-Mikity syndrome, chylothorax and congenital pulmonary lymphangiectasia, congenital lobar 
emphysema, cystic fibrosis, hystiocytosis X, and acute infections. The second group 
includes congenital heart disease, foregut duplication, tracheo-oesophageal fistula, diaphragmatic hernia, and 
asphyxiating thoracic dysplasia. 