Thanks for putting your query up at HealthCareMagic. I understand your concerns for your 4 year old son. Many children have a natural tendency to suffer from cough and cold. Cold depresses our immunity and in the meanwhile certain viruses that are always around, do the harm. It also has an allergic component wherein non-harmful agents like dust are treated by the body with apprehension and results in cough. The tonsils which are located at the back of the neck, often become enlarged and play an important role in cough and cold. The tonsils regress with age and I guess you would have to wait till then when the tendency to catch cold would automaically come down. There is an internal connection between the throat and ear and hence during cold we often feel a pain in the ears. But that is probably not a cause for concern. There is no medicine that can change the genetic make up of a person. I insist that you try to make your child gurgle with lukewarm water and if required give him some antiallergics after consulting your doctor.

I hope that answers your query. Feel free to revert back in case of further queries.