An introduction to Down syndrome

Down syndrome is a naturally occurring genetic condition caused by an extra chromosome. Babies have been born with Down syndrome throughout history, across every country and to parents of all ages, races, religions, and backgrounds.

What is Down syndrome?

Meet George Webster, actor, TV presenter and Mencap ambassador.

In this video George dispels five myths about Down syndrome.

If you’ve discovered that your baby (or a friend/family member’s baby) has or may have Down syndrome, you may be worried and afraid, unsure of what your future holds and what life will look like. At Down Syndrome UK we understand, and we are here for you; you are not alone.

If you're a parent or expectant parent and you'd like to connect with others, join our community using the links below...

Nobody told me book laid out on top of other books in a fan

Our #NobodyToldMe the truth about Down syndrome book is a collection of personal lived-experiences written by young people with Down syndrome, their friends and family. We post a copy with our congratulations and compliments to expectant and new parents when they connect via our closed Facebook groups.

Did you know?

1 in 700 babies born with Down syndrome globally

750 babies with Down syndrome born in the UK each year

60+ years – Down syndrome is no longer life limiting

3 types – there are different forms of Down syndrome

What can it mean to have Down syndrome?

Learning and development

Everyone with Down syndrome has a learning disability; with the right support, most will meet the usual childhood milestones and can make good progress at mainstream school. Having a learning disability does not mean a person can’t learn, it generally means it takes longer to master new skills.  And as with the rest of the population, most children with Down syndrome become lifelong learners. 

Physical characteristics

Historically people with Down syndrome have been represented by an outdated list of characteristics. At Down Syndrome UK, we see and value each person as a unique individual, with their own personality, strengths, and areas where they may need support to thrive.

Modern life with Down syndrome

Today’s reality for many people with Down syndrome is vastly different from past generations. There are higher expectations, more experience and greater opportunities for people with Down syndrome to be able to live their best lives.

Many people with Down syndrome are

  • Attending mainstream schools
  • Going to college and university
  • Living semi/independently
  • Forming relationships and getting married
  • Working in paid employment
  • Participating in sports and arts
  • Contributing to their communities
  • Advocating for themselves and others

How does Down syndrome occur?

Down syndrome is a naturally occurring genetic difference, usually involving an extra copy of chromosome 21 in every cell. This happens at the time of conception and is entirely random, there is no connection to anything parents do before or during pregnancy.

In around 99% of cases, having Down syndrome is not inherited and happens completely by chance.

While the likelihood of having a baby increases with parental age – especially after 35 – most babies with Down syndrome are born to younger women. The average age of a mother of a baby with Down syndrome is understood to be 29 years.

Babies with Down syndrome are born to families across the world, regardless of race, ethnicity, or background.

There are three types of Down syndrome

Trisomy 21 (95% of cases)

Every cell in the body has three copies of chromosome 21 instead of two. This is the most common form and occurs during cell division.

Translocation (3-4% of cases)

Part or all of an extra chromosome 21 attaches to another chromosome.

Mosaicism (1-2% of cases)

Only some cells have the extra chromosome 21, while others have the typical two copies.

Health and life expectancy

The life expectancy for people with Down syndrome has dramatically improved over recent decades. In 1983, the average life expectancy was just 25 years. Today, it’s nearly 60 years and continuing to increase.

Why has life expectancy improved?

  • Increased social inclusion and support.
  • Community-based living instead of institutionalisation.
  • Better understanding of associated health conditions.
  • Better medical care and early intervention.
  • Improved heart surgery techniques.

Health and life expectancy

Some people with Down syndrome have additional health needs, but it’s important to note that not every person with Down syndrome will present with a health need. Additionally, none of the health needs that present in people with Down syndrome are unique only to them – all of them can be managed and treatments are well-documented.

Possible Conditions:

  • Heart defects – congenital heart issues, many resolving on their own but a minority will require surgery.
  • Sleep apnoea – breathing interruptions during sleep which are treated with medication or a sleep mask/monitor.
  • Hearing – often due to ear infections or ear structure. Simple treatments like grommets or hearing bands can resolve these.
  • Vision – people with Down syndrome have a lack of clarity of vision and are usually long-sighted, may have cataracts or squint.
  • Thyroid conditions – usually hypothyroidism which is treated with medication.
  • Gastrointestinal issues – including blocked intestines is common with some babies and may require minor surgery, for example duodenal atresia.

Health and life expectancy

Early intervention and ongoing support can make a significant difference in outcomes for those with Down syndrome. Key areas of support include:

Myth vs Reality

Reality: People with Down syndrome experience the full range of human emotions!

Reality: Many people with Down syndrome live semi-independently or independently

Reality: Many people with Down syndrome are employed and active community members

Reality: Each person is unique with individual personalities, interests, and abilities

Looking forward

The future continues to look brighter for people with Down syndrome. Advances in medical care, education, employment opportunities, and social inclusion mean that people with Down syndrome today can expect to live longer, healthier, and lead more independent lives than ever before.

At Down Syndrome UK, we’re committed to ensuring that every person with Down syndrome has the opportunity to live a fulfilling life and reach their full potential. We provide information, support, and advocacy to help make this vision a reality.

Key Takeaways:

  • Down syndrome usually means having an extra copy of chromosome 21
  • 1 in 700 babies worldwide have Down syndrome
  • Average life expectancy has improved dramatically to nearly 60 years
  • Each person with Down syndrome is unique with their own strengths and personality
  • With support, people with Down syndrome can lead fulfilling lives
  • Early intervention and ongoing support make a significant difference to improving outcomes

Language matters

It is vitally important that people have a contemporary understanding of what life is like having Down syndrome in modern Britain and that language used when speaking of people with Down syndrome is respectful and accurate.  We have created some guidelines which we hope you will find helpful.