Contrary to common belief, teething has NO relation to fever or loose motions. These occur due to keeping of objects in the mouth by the baby. Since it's a normal physiological process,NO meds or supplements are required. Just maintain strict hygiene in feeds,give 2 solid meals a day including curds and bananas in the diet in addition to whatever you prepare at home,and 4 milk feeds, including one top formula feed and rest breastfeeds.