if you are giving only breastfeeding then there very less possibility that slightly loose to semi solid stool may be present intermittently. if you see that it is totally watery and also you are giving outside milk then it is advisable to get the child examined by the doctor to rule out any digestion problem or any infection. also give both hind and fore milk during breastfeeding as only fore milk will increase diarrhoea and green stool. need of probiotics (sachet superflora gg once a day can be given) and zinc has to be evaluated. in the meantime kindly continue breastfeeding to prevent dehydration. you can give ors also if water loss is more if there is blood in the stool then kindly meet the doctor immediately because it can be dysentery also.

Visit to Pediatrician physically for further evaluation