I would like to know the signs of asthma in babies who are less than a year old?
wheezing, fast breathing, persistent coughing, they find it harder to breathe, panting from something as little as playing, etc
Common childhood asthma signs and symptoms include:

Frequent, intermittent coughing.

A whistling or wheezing sound when exhaling.

Shortness of breath.

Chest congestion or tightness.

Chest pain, particularly in younger children