If the baby is feeding normally and active,just give steam inhalations 3-4 times a day,use paracetamol for fever,repeat 4 hourly if required.
Urine test is normal.
CRP indicates inflammation,in this case due to infection,probably viral,should start down in 3-7 days.
If it doesn't,or baby is dull and not eating,consult your paediatrician urgently.