Teething shouldn’t cause any change in the number of soiled nappies. One reason for this common misconception is that many parents begin feeding their children solid food at six months, around the same time teething starts. This is often what’s actually affecting any changes in your child’s bowel movements. If your child has diarrhoea for longer than 24 hours, you should make sure they drink plenty of fluids and make an appointment to see your paediatrician.