How to Quickly Treat Diarrhea in Children?

A child has had diarrhea for ten days, with stool frequency of 6-7 times a day, green or yellow in color, resembling egg whites, and has an unpleasant odor. How should it be treated? I suspect it was caused by eating cherries during the May Day holiday, and it has been ten days since then. Currently, the condition has not improved. Previous diagnoses and treatment processes and effects: see.
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