Hi!
Not sure if this is the same case for your child, but you can refer to this article:
http://www.chrisjohnsonmd.com/2009/06/22/wheezing-in-infants-and-toddlers-what-to-do/
The author (a doctor) highlighted that wheezing is more of a symptom. Hence, I think may be good to consult your doctor for some suggestions.