Hello Since the CRP is raised ther is infection . For that u have to take a course of antibiotic. If the infection doesn't subside by this oral medication baby has to be shifted on iv antibiotics as it is more effective than oral . Intravenous antibiotic cannot be given at home . It has to be given in hospital . U don't have to worry about this as nothing serious. But it's better to get admitted if fever dosent decrease and to take INtravenous antibiotic for faster relief .