Hi my son is 5 months old and has a little bit of a wheeze. It only happens when he is playing and inhaling deeply and does not occur whe he is sleeping, eating, or awake. He does not have a fever, cough, or any other symptoms. I m not sure if it is just a new sound he has discovered or I should take him immiliatly to get checked.
Wheezing could occur due to narrowing of the respiratory tracts, what we call bronchospasm. If not due to cold, it could also occur due to exertion as during playing. But I would not consider it normal and would suggest you to consult a doctor who can examine the chest and may be also get an echocardiography done if he feels required (to rule out any congenital heart disease that could be a cause).