A fever of 38.8 is usually due to an infection.The most likely causes in a boy of 3 years are an ear or throat infection. Another possibility is he may be getting flu or some other viral illness. I cannot tell you exactly what the cause is for your son's fever without being able to see him. As he has a definite fever it would be best to give him Panado or a similar safe medicine to lower his fever. If he still has a fever tomorrow he should be seen by his doctor.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.