For upper respiratory infections in children causing colds and coughs, the treatment approach should vary based on the child's age, as well as the severity and duration of the illness. For mild cases with less severe symptoms, treatment can be administered at home including frequent hydration, drinking plenty of water, and symptomatic oral administration of expectorants and cough suppressants. If the child's cold and cough symptoms are more severe, with significant coughing and phlegm, and are even affecting the child's sleep, it is typically recommended for parents to take their child to the hospital for blood tests. These tests may include a complete blood count, Mycoplasma testing, or a C-reactive protein test, to identify the specific cause of the cold and cough, and to enable targeted treatment. (Note: The use of medication should be under the guidance of a professional doctor.)