teething itself doesn't cause diarrhea. prevent diarrhea during teething by giving the child clean things to chew, like teethers and hard substances like rusk and toast.

Teething doesn't cause diarrhoea, its a myth. The explanation is that by 5 months age mouthing stage begins and the child puts everything into mouth. This causes transmission of organisms causing all such symptoms. As a prompt measure put the child on WHO ORS and watch for urine output. Do see a child specialist since your baby is too young and might require more medicines. By the way bottle feeding also can b a source of such infections.