If mild,give just steam inhalations for cold and cough and decongestant nasal drops for nasal block or increased cough on lying down. Give ors after every loose motion if watery and give a light diet including curd and Banana. Use paracetamol for fever and repeat every 4 hours if required. Syp ondem can be given 30 mins before meals for vomiting. If not improving,plz consult your paediatrician asap.