Darling 3 years old half have a fever suddenly highest 39.4 today, say collywobbles, how to do

My baby is three and a half years old and suddenly has a fever of 39.4 degrees. He said that his stomach hurts. It may be a viral cold. Suggestion: You can take your baby to the hospital for a blood test. If it is a viral infection, you should take antiviral drugs and antipyretic drugs. Give your baby plenty of water and a light diet.