How to Handle a Baby’s Dry Vomiting and Diarrhea?

The baby vomited during dinner two nights ago, followed by watery diarrhea with an odor of rotten eggs, decreased urine output, and a poor mood. After hospital treatment, including intravenous drips, it has been two days, but the baby still refuses to eat, even porridge or anti-diarrheal milk. How should parents handle frequent diarrhea situations?
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