Asthma
Asthma occurs when the main air passages of your lungs, the bronchial tubes, become inflamed. The muscles of the bronchial walls tighten, and cells in the lungs produce extra mucus further narrowing your airways.  This can cause minor wheezing to severe difficulty in breathing.

Bronchiolitis
Bronchiolitis is a lung infection that can be caused by several kinds of viruses.

Bronchopulmonary dysplasia
Babies who are born prematurely or who experience respiratory problems shortly after birth are at risk for bronchopulmonary dysplasia (BPD), sometimes called chronic lung disease.  Although most infants fully recover from BPD and have few long-term health problems as a result, BPD can be a serious condition requiring intensive medical care. A child is not born with BPD. It is something that develops as a consequence of prematurity and progressive lung inflammation. 

Chronic lung complications
Chronic lung disease is a condition in which damaged tissue in a newborn baby's lungs causes breathing and health problems. The lungs trap air or collapse, fill with fluid, and produce extra mucus.  Most babies who have chronic lung disease survive, and many outgrow their lung problems.

Congenital Heart Disease
Congenital heart disease refers to a problem with the heart's structure and function due to abnormal heart development before birth. Congenital means present at birth.

Dehydration
Dehydration is defined as the excessive loss of water from the body.

Lower Respiratory Tract Infection
The lower respiratory tract consists of the trachea, bronchial tree, and lungs. Lower respiratory tract infection often refers to pneumonia, but can also be applied to other types of infection including lung abscess, acute bronchitis and emphysema. Symptoms typically include shortness of breath, weakness, high fever, coughing and fatigue.

Pneumonia
Pneumonia is inflammation of part of the lung.  Inflammation is the immune system's response to a foreign invader or injury, often due to infection with germs, such as bacteria or viruses.

Viral
Relating to or caused by a virus.

Wheezing
A wheeze is a high-pitched whistling sound made when air flows through narrowed airways in the lungs, usually when people breathe out.