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.
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flumicil works for me! otherwise try yuguo TCM at kembangan. they are really good and effective. but prepared to wait and spend a couple of hours there.
It sounds like mucus backflow too. You can consider using a diffiuser in a room to provide some moisture. and let baby sleep slightly elevated