How to Handle Recurring Diarrhea in Young Children?

My son is about to turn six months old. Previously, his diarrhea tests showed white blood cells in his stool, and after taking medication, he had one or two bowel movements a day. Yesterday, he had four bowel movements. This morning, he had two more. I’m very worried about recurrence. He has been taking probiotics. Is this still considered diarrhea? Can he get a vaccine? Can we introduce solid foods?
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