What Can I Give My Preterm Baby To Treat Recurring Diarrhea, Currently Occurring 7 Times A Day?

Hello, my baby girl is 9 months old with 8 kg wait. She has been admitted in hospital for loose motion. She got discharged and now after 3 weeks, again she is doing loose motion 7 times a day . I gave her flora BC syrup & ofm since yesterday. I have vizilac as well what to give exactly. Also, I have stopped to give cow milk now & giving only nestle cerelac rice with mixed fruit . What to give to fix her loose motions. She is prebirth baby and born in 7 month. Now she turned 9 month. I am sick of her loose motion. Please prescribe