6m+ baby diarrhea for a week

Hi mummies out there, anyone ever encounter 6m+ baby diarrhea for more than 1 week? Seen 2 doctor both says don’t need to change milk and don’t need to stop solid food~ been giving diarrhea med and probiotic but the diarrhea quantity doesn’t reduce each day~ Kindly share your advices on what to do, thank you:)