How to Treat Baby Diarrhea and Indigestion?

My baby is three months old and has been experiencing diarrhea with a sour taste and granular milk residue. The stools are particularly runny and watery, and there’s a yellow stain on the diapers every two changes. The baby’s bottom has become slightly red due to the diarrhea. The condition has persisted for over a month, and after detailed laboratory tests, the results were normal. The baby has never received treatment. I would like to know how to proceed with treatment and what measures can be taken to improve the baby’s condition?
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How to Treat Baby Diarrhea?

My baby has had pale yellow, loose stools, sometimes resembling water, about ten to fifteen times a day for the past few days. After three days of hospital treatment, all stool tests have been normal, but there is no improvement. What treatment methods are available? Thank you. The duration of the illness and current condition: 3 days. Medical history: The day before the diarrhea, the baby’s body temperature was slightly high.
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