How to Treat Cough in Children Caused by Cold

Children with excessive phlegm and wheezing due to colds, accompanied by snoring during sleep. Similar symptoms occurred at four months old, improved after treatment, but recurred at eight months old and have not improved. The latest episode was at twelve months old, despite saltwater therapy and nebulizer treatments, the effect was poor. After another visit to the doctor and re-treatment, there was still no improvement. Is this possibly asthma? How should we treat it?
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