Baby having loose stools and cough.

Dear mam Weight 8.5kgs 6 month started We giving neubilisation also at home with 3% ns water  Baby having loose stools per day around 8 since a week . Before that and now also he was having cough and runny nose we used antiboitic nad stopped since a week even though he was getting loose stools pls  advice. And we have not given vaccine also for 5th month pls advice .. 1. May I know if he getting tooth than also motions will come or not becoz my parents saying it will be might be for tooth is it real or not 2. pls advice any syrup for motions becoz no use with derolac and sporlac sachets which I given . 3. And for cough can I use ambrodyl syrup for 6 month running baby or not pls advice with quantity per dose .