Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Bronchopulmonary Dysplasia ?
    ### Response:
    Bronchopulmonary dysplasia (BPD) develops as a result of an infant's lungs becoming irritated or inflamed.
                
The lungs of premature infants are fragile and often aren't fully developed. They can easily be irritated or injured within hours or days of birth.
    