What should I do if my baby has a fever and refuses to eat?

Patient's question:

Got bigger. A few days ago, the baby had a bit of green sputum, and yesterday noon, they started having a high fever of 38°C. They went to the hospital for a blood test, and the doctor said all blood test results were normal, and there was no inflammation in the throat. The doctor prescribed some medicine (Calcium Fosfomycin Tablets, Compound Pepsin Granules, Antiviral Granules, and Fever Reducer). After coming home, the baby hasn’t eaten anything since yesterday afternoon at 5 PM. They vomited once when taking medicine at 6 PM. This morning, they drank 150 ml of milk, but at 10 AM when taking medicine again, they vomited and then stopped eating. I had no choice but to give them a can of yogurt, and they actually ate it. But so far, the baby still hasn’t eaten anything, and they keep having fever. What should I do? Can yogurt replace milk? I’m a bit worried because they’re not eating.
Past treatment and effectiveness: This situation hasn’t occurred again.
What kind of assistance is desired: The baby still hasn’t eaten anything, and they keep having fever. What should I do? Can yogurt replace milk? I’m a bit worried because they’re not eating.

Doctor's answer:

When a child has a fever due to illness, it usually leads to a loss of appetite and a lack of interest in food, which is a normal phenomenon. Under normal circumstances, a person's appetite is related to digestive function and nervous regulation. Fever is a severe systemic response to increased activity in the sympathetic nervous system. Increased sympathetic nervous system activity can lead to increased secretion of saliva and digestive fluids, weakened gastrointestinal activity, and reduced digestive enzyme activity. At this time, food cannot be properly digested and absorbed in the gastrointestinal tract, but instead remains there for a long time, causing the child to feel full. Therefore, this leads to a loss of appetite.

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