Bronchopulmonary dysplasia (BPD) is abnormal development of the lungs in infants. It is considered a chronic lung disease. BPD can make it difficult for the infant to breathe. The condition usually develops in the first four weeks after birth.

Infant Airway and Lungs
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The exact cause of BPD is unknown. It is most often associated with complication of early lung disease or their treatments. These conditions or treatments can cause irritation and swelling of lungs and airways. This can lead to BPD.