How to Treat Infant Diarrhea?

A friend’s baby just turned 1 year old, has been weaned for a week, and has been introduced to various complementary foods early on. The baby’s gastrointestinal feeling isn’t very good, and it will have diarrhea if it eats a bit more. My friend is a bit worried and wants to consult on how to treat this kind of infant diarrhea.
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