Down's syndrome is caused by an extra chromosome in your cells. In the majority of cases it can't be inherited, and occurs by chance at the time of conception.
Down's syndrome is a genetic condition that happens as a result of an extra chromosome (chromosome 21).
Chromosomes explained
Our bodies are made up of cells that contain genes. Genes are grouped in thread-like structures called chromosomes.
These contain detailed genetic instructions for lots of different things, including:
how a baby's cells developtheir gendertheir eye colour
Usually, cells contain 46 chromosomes: 23 from the mother and 23 from the father.
In people with Down's syndrome, all or some of the cells in their bodies contain 47 chromosomes instead, as there's an extra copy of chromosome 21.
In most cases, Down's syndrome is not inherited and it's just the result of a one-off genetic change in the sperm or egg.
What are the chances of having a baby with Down's syndrome?
With every pregnancy, there's a small chance of having a baby who has Down's syndrome.
Some people are more likely to have a child with Down's than others.
The main thing that increases the chance of having a baby with Down's syndrome is the mother's age.
For example, a woman who is:
20 years old has a 1 in 1,500 chance30 years old has a 1 in 800 chance35 years old has 1 in 270 chance40 years old has a 1 in 100 chance45 years old has a 1 in 50 or greater chance
But babies with Down's syndrome are born to women of all ages.
Your chance of having a child with Down's syndrome is also increased if you previously had a child with Down's syndrome.
For most people, this chance is still small (around 1 in 100).
There's around a 1 in 2 chance of a child having Down's syndrome if one of his or her parents has the condition.
Down's syndrome is a genetic condition that happens as a result of an extra chromosome (chromosome 21).
Chromosomes explained
Our bodies are made up of cells that contain genes. Genes are grouped in thread-like structures called chromosomes.
These contain detailed genetic instructions for lots of different things, including:
how a baby's cells developtheir gendertheir eye colour
Usually, cells contain 46 chromosomes: 23 from the mother and 23 from the father.
In people with Down's syndrome, all or some of the cells in their bodies contain 47 chromosomes instead, as there's an extra copy of chromosome 21.
In most cases, Down's syndrome is not inherited and it's just the result of a one-off genetic change in the sperm or egg.
What are the chances of having a baby with Down's syndrome?
With every pregnancy, there's a small chance of having a baby who has Down's syndrome.
Some people are more likely to have a child with Down's than others.
The main thing that increases the chance of having a baby with Down's syndrome is the mother's age.
For example, a woman who is:
20 years old has a 1 in 1,500 chance30 years old has a 1 in 800 chance35 years old has 1 in 270 chance40 years old has a 1 in 100 chance45 years old has a 1 in 50 or greater chance
But babies with Down's syndrome are born to women of all ages.
Your chance of having a child with Down's syndrome is also increased if you previously had a child with Down's syndrome.
For most people, this chance is still small (around 1 in 100).
There's around a 1 in 2 chance of a child having Down's syndrome if one of his or her parents has the condition.
Living with Down's syndrome
With help and support, most people with Down's syndrome are able to have healthy, active and more independent lives.
New parents
If you have recently found out your baby has Down's syndrome, you may be feeling a whole range of emotions, including fear, joy, sadness or confusion. There's no right or wrong way to react.
It's important to remember you're not alone in your situation. Thousands of people in the UK have Down's syndrome.
There are also lots of people who have experience of supporting and caring for people with Down's syndrome.
The Down's Syndrome Association helpline (0333 1212 300) can offer you advice and answer any questions you may have.
Lots of new parents find it reassuring to talk to other parents. The Down's Syndrome Association can also put you in touch with another family who have a child with Down's syndrome.
Read more information for new parents on the Down's Syndrome Association website.
Helping your child
There are various things you can do to help your child with their learning and development.
Things that may be useful include:
using play to help your child learn – for example, show them how to play with their toys, and use toys to encourage them to reach, grasp and movenaming and talking about things your child's looking at and is interested ingiving your child the opportunity to mix with other childrenencouraging your child to be as independent as possible from an early age with things like feeding and dressing, getting ready for bed, brushing teeth and going to the toiletplaying games to teach new words – a home-visiting teacher or speech and language therapist can give you some ideas
Professional support
A number of different professionals experienced in supporting children with Down's syndrome will be able to help you and your child.
Ask your child's paediatrician, GP or health visitor about the services available in your area.
Services for children with Down's syndrome typically include:
speech and language therapy physiotherapy home teaching programmes
You'll be advised about things you can do at home to help your child learn and develop.
For more information and advice, read about children and young people's services and assessing your care needs.
You can also call the Down's Syndrome Association helpline on 0333 121 2300 for advice.
Regular health check-ups
Children and adults with Down's syndrome need regular check-ups to monitor their health.
These check-ups will usually be with a paediatrician at first. Your GP may do them as your child gets older.
The health check-ups may involve:
hearing and vision testsmeasuring height and weightblood tests to check for thyroid problemschecking for signs of heart problems
If your doctor has any concerns, they can refer you to a specialist.
School and your child
Lots of children with Down's syndrome are educated in mainstream nurseries or schools with support.
But individual needs vary, and some parents feel a special school will be most suitable for their child.
It might help to visit some mainstream and special schools in your local area. Talk to the staff about how they would meet your child's special educational needs.
Read more about special educational needs and children with a learning disability.
You can also find out more about education on the Down's Syndrome Association website.
Teens with Down's syndrome
Until the age of 18, child health and social care services are responsible for the care of children with Down's syndrome.
From 18, it's usually the responsibility of adult services. Between the ages of 16 and 18, your child will start a "transition" to adult services.
Adults with Down's syndrome
Further education and employment
Lots of young adults with Down's syndrome pursue further education, and many go on to work.
Living independently
With help and support, lots of adults with Down's syndrome can lead an active and fairly independent life.
Although it may not be possible to live completely independently, some adults with Down's syndrome leave home and live in their own accommodation with support.
Adults with Down's syndrome often move into property owned and staffed by a housing association.
Staff can provide different levels of support depending on the person's particular needs.
If necessary, a social worker may be able to help with finding accommodation.
An occupational therapist can offer practical advice to help make independent living easier.
Read more about disability and independent living and supported living services.
Relationships, sex and fertility
Lots of people with Down's syndrome have loving relationships, although they may need some support.
They'll need to learn what relationships mean and how they can have a happy, safe relationship.
Men and women with Down's syndrome tend to have lower fertility. This does not mean they cannot have children, but it does make it more difficult.
If one partner in a couple has Down's syndrome, there's around a 1 in 2 chance of each of their children having Down's syndrome, too.
The risk of miscarriage and premature birth is also higher in women with Down's syndrome.
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