What is the situation when a child has a persistent fever and a bad odor in their mouth?

Patient's question:

My little baby had a high fever of 38.5 degrees this morning, and then took fever-reducing medicine. Around noon, the fever subsided quite a bit, and they broke out in a sweat (but didn’t change their clothes). After that, their speech returned to normal. In the afternoon, they ate mother chicken soup, tea eggs, and drank milk. I’m not sure if this interfered with their health. However, during dinner that evening, they suddenly broke out in a fever again, with a temperature exceeding 39.5 degrees. They received a fever-reducing injection, but the temperature hasn’t come down yet. But suddenly, there’s a rotting odor in their mouth. I don’t know what’s going on? Please help me sort this out.
Previous treatment and effectiveness:
This hasn’t happened before. What kind of assistance would you need?
Help me guess what might be the reason? What should I do now? What should I pay attention to in the future? Urgent assistance is needed.

Doctor's answer:

Children with fever often experience gastrointestinal digestive dysfunction, and when vomiting, it is recommended to bend forward and turn the head to avoid choking and potential lung infection.
Medical Advice: It is advisable to use physical cooling methods and fever-reducing medications for fever. Children's ibuprofen can be used. Nausea is a sign of reduced gastrointestinal absorption function. It is recommended to increase food intake, temporarily stop complementary foods, and feed with dissolved milk. In cases of severe nausea, fasting for 12-24 hours is recommended. Pay close attention to whether the child also experiences abdominal pain and nausea/vomiting.

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