Please stop giving Oflox 50 immediately. Giving this strong antibiotic combination for 20 days is unsafe for an 8-month-old and can worsen diarrhoea by destroying healthy gut bacteria. Chronic diarrhoea lasting 4 months is a serious medical concern that requires immediate evaluation by a paediatrician. It could be caused by milk protein allergy, lactose intolerance, or antibiotic-induced gut damage. Do not start any new medications on your own. Ensure your baby stays hydrated by offering Oral Rehydration Salts (ORS) alongside breast milk or formula, and consult a paediatrician immediately for a proper diagnosis.