I myself being parent and having faced similar situation,understand your concern.
For many children who have asthma
before age 3, there is a good chance asthmatic symptoms go away in the next few years. This is particularly true for children who have no family history of allergy
or asthma and who started wheezing
because of an infection.
While in some others ,it doesn't go.
What is important is management and precautions.
See if he is wheezing, waking up at night or having difficulty breathing