Common childhood asthma signs and symptoms include: 
Frequent coughing that worsens when your child has a viral infection, occurs while your child is asleep or is triggered by exercise or cold air
A whistling or wheezing sound when breathing out
Shortness of breath
Chest congestion or tightness
 Childhood asthma might also cause: 
Trouble sleeping due to shortness of breath, coughing or wheezing
Bouts of coughing or wheezing that get worse with a cold or the flu
Delayed recovery or bronchitis after a respiratory infection
Trouble breathing that hampers play or exercise
Fatigue, which can be due to poor sleep
 Asthma signs and symptoms vary from child to child, and might get worse or better over time. Your child might have only one indication, such as a lingering cough or chest congestion. It can be difficult to tell whether your child's symptoms are caused by asthma. Periodic or long-lasting wheezing and other asthma-like symptoms can be caused by infectious bronchitis or another respiratory problem.