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Fragile X Association of Australia

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  • Every week in Australia, one child is born with Fragile X.
  • Around 1 in 3600 boys and 1 in 4000-6000 girls have Fragile X.
Fragile X syndrome is a genetic condition that causes intellectual disability and challenges with learning and behaviour. Early intervention can help children with Fragile X unlock their abilities and reach their full potential.

What is Fragile X syndrome?

Fragile X syndrome is a genetic condition that causes intellectual disability and is the most common known cause of inherited autism.

Children with Fragile X can find it hard to understand or process information. These difficulties mean they can have problems with learning, behaviour and development.

Fragile X is the most common cause of genetically inherited intellectual disability. It affects more boys than girls and also affects boys more severely than girls. Fragile X appears in children of all cultures and ethnic backgrounds.

Fragile X carriers
People can be carriers of Fragile X syndrome without having the condition themselves. This means they have the gene and can pass it on to their children.

Male and female carriers of Fragile X might suffer from FXTAS (Fragile X-associated tremor/ataxia syndrome). This condition is more common in men and affects balance, as well as memory in older men with the gene.

Female carriers might suffer from FXPOI (Fragile X-associated primary ovarian insufficiency). This problem can lead to infertility and early menopause in women with the gene.

Signs and symptoms of Fragile X

The signs and symptoms of Fragile X can vary a lot from child to child. Some children are very obviously affected, whereas others have more subtle symptoms.

Physical characteristics
Fragile X can be hard to spot physically. But some children with Fragile X might have the following physical features:

  • long and narrow face
  • prominent ears
  • poor muscle tone – which can cause crossed eyes or a squint, extra curve in the spine or slack face muscles (particularly in young children)
  • loose joints (‘double joints’) that move a lot more than usual
  • flat feet.

Cognitive signs
Intellectual disability and developmental delay are the most common features of Fragile X. Many children with Fragile X also have difficulties with fine motor skills, gross motor skills and delayed speech development.

Behaviour signs
If your child has Fragile X, you might notice some that your child behaves differently from other children or has delayed development.

Other common signs of Fragile X include:

Associated medical concerns
Children with Fragile X can have other medical concerns like:

If your child has these problems, your paediatrician can diagnose them and help you find ways to manage them in everyday life.

Ability not disability

Children with Fragile X often have a strong sense of humour and enjoy having fun, which can help overcome their social anxieties. And they’re often really good at things like:

  • learning visually, using pictures or computers
  • recognising words, numbers and patterns 
  • remembering things, like songs, movies or sports events 
  • undertaking practical, relevant tasks 
  • doing essential daily tasks 
  • being compassionate, helpful and friendly.

Children learn the most from the people who care for them and with whom they spend most of their time, so everyday play and communication with your child can help her a lot.

Diagnosis and testing for Fragile X syndrome

Fragile X can be diagnosed at any age, from before birth to adulthood. But the earlier it’s spotted the better, because early treatment can help children reach their full potential.

All children who have an intellectual disability, developmental delay or autism should be tested for Fragile X.

It’s also a good idea to have your child tested for Fragile X if:

  • your family has a history of Fragile X syndrome, intellectual disability or developmental delay
  • your child has the physical features or behaviour of Fragile X (regardless of family history)
  • your child has significant learning problems, trouble with understanding, ADHD or anxiety.

Your GP or paediatrician (or any other medical doctor) can order a DNA blood test to find out whether your child has Fragile X. It takes 4-8 weeks to get test results back, depending on which state of Australia you live in.

In some circumstances, Medicare might cover the cost of tests for Fragile X. For more information, see your GP or paediatrician.

Video Fragile X syndrome: overview

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In this short video, parents of children with Fragile X syndrome talk about this genetic condition. They talk about spotting the early signs, getting a diagnosis and their reaction to the diagnosis. Child health specialists explain how this condition happens. They also go through the physical, developmental, behavioural and emotional features of the syndrome.

Testing for Fragile X syndrome before or during pregnancy

If you’re pregnant or planning a pregnancy you might want to have testing done to find out whether you’re at risk of having a child with Fragile X syndrome.

All women can have Fragile X carrier testing, but Medicare funds it only for women with a family history of Fragile X. If you’re a carrier your baby can be tested for Fragile X while you’re pregnant. These tests are done with chorionic villus sampling (CVS) or amniocentesis.

Before you go ahead with antenatal testing for Fragile X, you might want to think about genetic counselling. Genetic counselling will help you understand your options and the effect the diagnosis might have on you and your family. A genetic counsellor can also support you as you make your decisions.

DNA tests are important for diagnosing genetic conditions like Fragile X syndrome. Our article on genetic testing has more information about DNA tests, what you can expect and some of the things you need to know beforehand.

Early intervention services for children with Fragile X syndrome

Although there’s no cure for Fragile X syndrome, early childhood intervention services can help improve outcomes for your child. Through early intervention services, you can work with health professionals to learn ways of supporting your child that will help him reach his full potential.

The team of professionals involved in supporting you and your child might include paediatricians, genetic counsellors, occupational therapists, physiotherapists, psychologists, special education teachers and speech pathologists.

Together, you and your team can choose treatment and therapy options to best help your child. The best treatment for Fragile X involves using a multidisciplinary approach to look after your child’s education, behaviour and medical needs in combination.

Video Fragile X syndrome: after the diagnosis

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In this short video, parents of children with Fragile X syndrome discuss different therapies for children. Parents and child health specialists talk about why it’s important to get early intervention as soon as possible after diagnosis. Health specialists say that children with Fragile X develop different skills at different rates. A team of therapists working together is the best way to help them.

Financial support for children with Fragile X syndrome

If you live in a National Disability Insurance Scheme (NDIS)  trial area and your child has a confirmed diagnosis of Fragile X syndrome, your child can get support under the NDIS. The NDIS helps you get services and support in your community, and gives you funding for things like early intervention therapies or educational support.

If you don’t live in one of the NDIS trial areas, your child can get funding under the Better Start for Children with Disability initiative. If your child is eligible for the NDIS, she’ll be moved over when it becomes available in your area. Read our NDIS and Better Start FAQs for more information.

Looking after yourself

Although it’s easy to get caught up in looking after your child, it’s important to look after your own wellbeing too. If you’re physically and mentally well, you’ll be better able to care for your child.

If you need support, a good place to start is with your doctors and genetic counsellors.

You can also get support from the Fragile X Association of Australia (FXAA). The FXAA provides support to families affected by Fragile X, and offers a range of services including counselling, clinical services, parent support, research and education groups. You can contact the FXAA by phoning 1300 394 636 or emailing

If you have a child with Fragile X, you can probably get many services and supports. But finding your way through the disability services system can be tricky. Our overview of disability services is a good place to start. 
  • Last updated or reviewed 19-03-2018
  • Acknowledgements

    This content was funded by the Australian Government Department of Families, Housing, Community Services and Indigenous Affairs, and developed in collaboration with the Better Start Initiative. The Victorian Clinical Genetics Service assisted in the development of this content.