H.W.
Teething babies generate a lot of saliva, and so, these acids are swallowed in greater amounts, which can contribute to a lot of runny stools. Doctors often say that there is no correlation between teething and more stool, but after many years of working with a large number of babies, I can tell you it's extremely common. As long as the child is still urinating (wet diapers, not just poopy ones), things should be fine. Keep the child hydrated with breast milk/formula, and relax. If the diapers have *only waste* and no urine, then it's time to see the doctor, so that they can check for dehydration.