There is no evidence that immunity boosting medicines have any role at boosting immunity. In children below 6 years it is hard to objectively diagnose asthma. The diagnosis is clinical and that's how we give medicines. At this point of time Budecort and flu vaccine seem reasonable approach. If symptoms persist, you should consult your doctor for modification of treatment

In addition to coloferrin one can try natural remedies like a combination of turmeric black pepper and ghee mixed together and given orally 2 to 3 times a day

Coloferin 1 scoop once per day x 3 months