• Gastroenteritis can cause dehydration, especially in young children and babies.
  • Everyone, especially children, needs to drink plenty of clear fluids if they have gastroenteritis.
  • Gastroenteritis is easy to catch.
  • Avoid spreading gastro - wash your hands with warm water and soap.
  • See your doctor if symptoms continue.
Gastroenteritis is a bowel infection that causes diarrhoea and sometimes vomiting. Diarrhoea is runny, watery bowel motions. The vomiting may settle quickly, but the diarrhoea may last up to 10 days. Bouts of gastro can cause dehydration, which can be dangerous for very young babies.

Causes of gastroenteritis

Gastroenteritis is caused by a variety of viruses and bacteria. If gastro occurs more than once the cause may be different each time. Gastroenteritis can spread easily.

Children with gastroenteritis must keep drinking

If your child has gastroenteritis, make sure they drink clear fluids (or breastmilk if your baby is breastfeeding). 

Babies under six months old can become ill quickly with gastro – they need extra fluids to replace fluids lost by diarrhoea and vomiting. If you are breastfeeding, continue to do this. If bottle feeding, give clear fluids for the first 12 hours, then give the normal formula in smaller, more frequent amounts.

It is important for the fluids to be taken even if the diarrhoea seems to get worse. It will help if you: 

  • Offer babies a drink every time they vomit.
  • Give older children a drink (150–200 ml) after every big vomit or bout of diarrhoea.
  • Give small amounts of fluids often if your child is vomiting a lot (a mouthful every 15 minutes).

Go to the doctor if your child is very sick

Take your child to the doctor if they:

  • vomit often
  • are not drinking 
  • show any signs of dehydration
  • have blood in their bowel motion (poo) 
  • report significant abdominal pain.

Babies under six months sometimes need extra visits to the doctor; they need to be checked again after six to 12 hours. Your doctor can advise what other steps to take.

Do not give medicines to reduce the vomiting or diarrhoea.

Watch for signs of dehydration

Go to your doctor if you notice that your child: 

  • has a dry mouth and tongue
  • is not passing urine (dry nappies)
  • has sunken eyes
  • as cold hands and feet
  • is more sleepy than usual.

Prevention of dehydration with gastro

To prevent your child becoming dehydrated give clear fluids like:

  • water
  • oral rehydration products that you buy from a pharmacist – follow instructions to make it up
  • diluted fruit juice (natural) – one tablespoon of juice to four tablespoons of water.
  • Children can eat their usual foods

    Your child may refuse food at first. This is not a problem as long as they drink clear fluids. Doctors now suggest there is no need to restrict food. Generally, if your child is hungry at any time, give them the food they normally eat.

    How to prevent the spread of gastro

    You can prevent the spread of gastro to other people if you:

    • Make sure everyone in the family washes their hands regularly, especially after they use the toilet and before they eat.
    • Wash your child’s hands with warm water and soap after they use the toilet and before and after they eat.
    • Wash your hands before you feed and after you change your child’s nappies.
    • Keep your child away from other children as much as possible until the diarrhoea has stopped.

    Your child should not attend child care or school until 24 hours after the diarrhoea has stopped.

    Where to get help


    More information


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    This page has been produced in consultation with and approved by: Department of Health and Human Services - RHP&R - Health Protection - Communicable Disease Prevention and Control Unit

    Last updated: October 2018

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