If mild, avoid unnecessary meds and just give steam inhalations for cold and cough and decongestant nasal drops for nasal blockade or increased cough on lying down. Use paracetamol for fever and repeat after every 4 hours if required. If not improving OR accompanied by other symptoms like wheezing or breathlessness and dullness or refusal to feed consult your paediatrician asap for physical examination and treatment.