Contrary to common belief,teething does not cause fever or loose motions,it's just coincidence,because children this age put everything in the mouth. Stop bottle feeding and breastfeeding if given,give just 2 milk feeds using a glass and 4 solid meals a day including curd and Banana in the diet. Give ors after every loose motion if watery. Add syp vizylac twice a day for 5 days. If not improving in 3 days OR accompanied by other symptoms like vomiting or fever or dullness and refusal to feed,consult your paediatrician.