Most fevers are viral in origin and take 3-7 days to subside completely. Children up-to the age of 8 years WILL fall sick 6-7 times a year,it's normal and a part of growing up. Just give steam inhalations for cold and cough and decongestant nasal drops for nasal block or increased cough on lying down. Use paracetamol for fever and repeat every 4 hours if required. Give a healthy balanced diet.