Difficulty breathing
Feeding difficulty - irritability with feeding, prolonged feeding time, refusal to feed
If an infant has to decide between feeding and breathing, he/she will choose to breathe
Sweating with feeds
"Exercise intolerance"
Failure to thrive
Fussiness
Older children: fatigue, exercise intolerance, dyspnea, orthopnea, abdominal pain, dependent edema
If an infant has to decide between feeding and breathing, he/she will choose to breathe
"Exercise intolerance"
Tachycardia
Tachypnea with labored breathing and accessory muscle use
Grunting with nasal flaring
Rales
S3 gallop
Hepatomegaly
Cyanosis, cool/mottled extremities
Decreased capillary refill
Edema of face and limbs
Congestive heart failure 
Airway obstruction
Lung transplant complications
Anaphylaxis, angioedema
High-output heart failure
Aspirated foreign body
Cirrhosis
Asthma exacerbation