Hello everyone ? Can anyone tell me who has experienced dysbacteriosi…

Hello everyone ? Can anyone tell me who has experienced dysbacteriosis? My daughter is 5 months old, she had dysbiosis, we were feeding her breast milk, how did you treat it? We were prescribed an antibiotic, but she's still so small ? after how long did it pass for you? Maybe it will go away on its own?! Please write everything as it was ? I'm worried ?