Suggest Remedy For Diarrhea In 5 Months Old

Hello Dr., My daughter is 5 months old and shr has now had diarrhea for over 10 days now. She passes green liquid stool around 8-9 times a day with 1-2 big ones and the rest being small. She was 6.2 kg and has already lost around 200-300 gms weight. Her diarrhea is not subsiding and I am worried. What should we do? Thanks for your help.