Suggest Treatment For Dark Greenish Stool In Infants

Dear Doctor my five month old baby going loose motion for the past 18 days still it s haven t stop I don t no what to do doctor ask me to give electrol powder still I giving there no any changes , that poo colour is dark green and jelly like going after a formula milk feed imm going please advise me doctor if I give electrol imm loose motion going pls advise me doctor