Does teething cause babies to develop 'the runs?'

This issue is often discussed on forums and the like as opinions are divided as to whether teething causes diarrhoea. There are parents who argue that their babies developed diarrhoea or 'the runs' when they were teething which is usually due to the excess saliva produced at this time.

But then there are others who state that diarrhoea is not caused by teething and is a sign of an infection, e.g. a stomach bug or related to bottle feeding.

The problem is that babies often develop diarrhoea which, if it occurs when they are teething, is seen as one of several symptoms of that process. Babies who are teething produce excess saliva or 'drool' which contains acid which upsets their stomach, the end result being diarrhoea.

Another side effect is nappy rash. This excess saliva also causes severe nappy rash which again, is due to the presence of acid.

Not every baby gets teething related diarrhoea so you may be one of the lucky ones. If they do then it does clear up quickly and is not usually a cause for concern. But if you are concerned then speak to your GP.

The main risk with diarrhoea is dehydration so ensure that your baby gets enough fluids at this time. If the diarrhoea is accompanied by other symptoms not related to teething such as a high temperature, swollen abdomen and vomiting then seek medical advice.

Diarrhoea can be caused by a food allergy, food intolerance, e.g. lactose intolerance, stomach bug or a feeding bottle which has not been properly sterilised.

A baby's digestive system is still developing which means that it takes time for it to become accustomed to liquids and then solids so don't be surprised if this causes problems now and again. A baby's digestive system has matured by the age of 6 months so start introducing him or her to solids. But be aware that it takes time for your baby to get used to solid foods.

For more information visit our teething and loose stools article.