u need to see any coughing, running nose, loss of appetite,if your bb just only fever, u can keep on checking the temperature and give Panadol if higher than 38.5
it should be fever, regardless the temperature is taken at the anus or the ear.
The temperature for fever is different when measured in the anus and ear. If the anal temperature is 38C, the temperature at the ear would be lower (my bb's is 1C lower). Therefore, if using the ear thermometer, calibration must be done and final checking with the anus is more desirable.