If mild,avoid unnecessary medicine,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. If not improving OR accompanied by other symptoms like vomiting or loose motions or coughing and breathlessness or dullness and refusal to feed,consult your paediatrician asap.