These tests are normal .      Frequent cough and colds maybe due to repeated viral infections or allergies .   In case there is a family history suggestive of allergies of any sort it is possible that your child is displaying the same tendencies . In that case you need to identify what the child is allergic to.     In case these are repeated viral infections then in general if  during an episode of cough and cold recovery takes place within a few days and child continues to grow well and all basic tests are within normal limits , you needn't get very worried . These infections will reduce over the next few years 

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