Suggest Cure For Sickness In The Stomach

My 4months baby girl is discharging Loose Watery light Green motion since last 12 days & whenever I feed her my breast milk immediately after few minutes her loose motion get started. I have consulated three Pediatriciations since last 10 days, one of them suggested to feed only Breast Milk to her & not to give any other food to her. One of them asked me to give breast milk and messed rice+Dal mixed with boiled water, messed banana, messed appale etc. to her. After giving all these also till now she used to have daily 7 to 8 times loose watery motion. Kindly advise me what is the problem & what is the remeady. Is my breast milk infected?