Down Syndrome

Overview

Down syndrome is a condition a person is born with. It affects how the body and brain grow and develop. It happens because a baby is born with an extra copy of one chromosome — chromosome 21. Chromosomes are tiny sets of instructions inside our cells that tell the body how to grow. Having that extra set of instructions changes the way the body and brain develop. People with Down syndrome usually have some level of learning disability, which means they may take longer to learn new things and may need extra support at school or work. But every person with Down syndrome is an individual, with their own personality, talents, feelings and goals. Down syndrome is not an illness and you cannot catch it from someone.

Down syndrome is one of the most common chromosome conditions. It affects roughly 1 in every 700 babies born, which means many thousands of babies each year around the world. Because people with Down syndrome now live longer than in the past, there are more adults with Down syndrome in our communities than ever before.

Down syndrome can affect any baby, in any family, in any part of the world. It is not linked to lifestyle, diet or where you live. The chance of having a baby with Down syndrome does go up as the mother gets older, especially after age 35, but most babies with Down syndrome are born to mothers under 35 simply because more babies are born to younger women. A small number of families have a higher chance because of an unusual chromosome pattern that runs in the family.

Symptoms

Common symptoms

• Some typical facial features, such as eyes that slant slightly upwards, a flatter bridge to the nose, small ears and a short neck
• Weak muscle tone (called hypotonia), which can make a baby feel floppy or 'loose' when held
• A learning disability, ranging from mild to more significant — everyone is different
• Slower development of speech and language skills
• Shorter height than average
• Small hands, sometimes with a single crease across the palm
• A gap between the first and second toes
• Health issues that are more common in Down syndrome, such as heart problems, hearing loss, vision problems and thyroid problems

Symptoms in children

• Meeting milestones later than other children — sitting, crawling, walking and talking may take longer
• Feeding difficulties as a baby, such as trouble latching on or tiring quickly during feeds
• Constipation, which is common and can be managed
• Frequent colds, ear infections and other infections
• Hearing problems, often caused by fluid or glue ear
• Vision problems such as short-sightedness or squints
• Sleep problems, including noisy breathing or pauses in breathing during sleep (sleep apnoea)
• About half of babies with Down syndrome are born with a heart defect, which doctors check for soon after birth

Symptoms in older adults

• Hearing and vision loss that gets worse with age — regular checks matter
• An underactive thyroid, which can cause tiredness, weight gain and low mood
• Sleep apnoea, which can cause poor sleep, daytime tiredness and behaviour changes
• Weight gain and obesity, which raise the risk of diabetes and joint problems
• Earlier menopause in women
• A higher chance of memory and thinking changes at a younger age than usual, including early signs of Alzheimer's disease
• Pain in the neck or a change in walking or arm strength, which needs checking quickly because the neck joints can be less stable

Causes

Main causes

• Trisomy 21: in about 95 in 100 cases, every cell in the body has three copies of chromosome 21 instead of the usual two. This happens by chance when the egg or sperm is forming.
• Translocation: in a small number of cases, an extra piece of chromosome 21 attaches to another chromosome. This can sometimes run in families.
• Mosaicism: in a few cases, only some cells have the extra chromosome. This happens by chance and the effects are often milder.
• Nothing a parent does, eats, drinks or feels during pregnancy causes Down syndrome.

Risk factors

• The mother's age — the chance rises with age, particularly after 35, but most babies with Down syndrome are born to younger mothers
• Having a previous child with Down syndrome
• One parent carrying a 'balanced translocation' — an unusual chromosome pattern that does not affect the parent but can affect their children
• These factors change the odds, but they cannot predict what will happen in any single pregnancy

When to see a doctor

See a doctor urgently if:

• A newborn who is very floppy, feeds poorly or seems unusually sleepy
• Breathing that is fast, noisy or laboured, or lips looking blue
• A fever in a young baby, or a fever with a rash, drowsiness or breathing difficulty
• Sudden neck pain, new weakness in the arms or legs, or a change in how someone walks
• A seizure, or a sudden collapse
• Severe constipation with a swollen, hard or painful tummy, or vomiting that will not stop

Book a routine appointment if:

• If you are pregnant and want to talk about screening options for Down syndrome
• If your baby or child seems to be meeting milestones later than expected, or you are worried about their development
• For regular health checks — heart, hearing, vision, thyroid, growth, teeth and sleep are all checked at set ages
• If you notice changes in behaviour, sleep, weight or energy that last more than a couple of weeks
• For advice about support at school, work, benefits or respite care

Diagnosis

Down syndrome can be found during pregnancy or after birth. During pregnancy, screening tests estimate the chance that a baby has Down syndrome, and a diagnostic test can then confirm it. After birth, a doctor may notice some typical physical features, and a simple blood test can confirm the diagnosis. Once Down syndrome is confirmed, there are also health checks to look for the conditions that are more common, such as heart defects and hearing problems.

Tests that may be done

• Combined screening test in early pregnancy (usually 11 to 14 weeks), using a blood test from the mother and an ultrasound scan
• Non-invasive prenatal testing (NIPT) — a blood test from the mother that looks at the baby's DNA and gives a more accurate chance estimate
• Amniocentesis or chorionic villus sampling (CVS) — diagnostic tests that take a small sample of fluid or tissue and give a definite answer
• Chromosome analysis (karyotype) after birth — a blood test that confirms the diagnosis and shows which type of Down syndrome it is
• Echocardiogram — an ultrasound of the heart, usually done in the first weeks of life
• Newborn hearing screening, plus follow-up hearing tests
• Vision checks, thyroid blood tests and growth monitoring, repeated at set ages

What to expect at your appointment

Waiting for test results can be an anxious time, and results may take from a few days to a couple of weeks depending on the test. A specialist, often a genetic counsellor or paediatrician, will explain what the results mean and what happens next. There is no rush to make decisions — you can ask questions, take time to think, and ask for a second conversation. If your baby is diagnosed after birth and you feel shocked or upset, that is completely normal, and support is available for you as well as your child.

Treatment

There is no cure for Down syndrome, and none is needed — it is part of who a person is. Care focuses on keeping the person healthy, supporting their development and helping them take part fully in family, school, work and community life. A team of professionals usually works together, which may include a paediatrician, GP, speech and language therapist, physiotherapist, occupational therapist, hearing and vision specialists, a cardiologist, a psychologist and teachers.

Self-care at home

• Keep up with recommended health checks, even when everything seems fine
• Attend hearing and vision tests — problems here are common and easy to miss, and treating them helps learning and behaviour
• Support speech and language from an early age through play, reading, singing and talking together
• Encourage physical activity and movement, which builds strength and helps with low muscle tone
• Keep teeth and gums clean with regular dental visits
• Look after skin, especially in skin folds, to prevent soreness and infection
• Keep a simple record of appointments, medicines and questions, so you feel prepared for each visit
• Encourage independence in small daily steps — dressing, choosing, tidying, cooking — matched to the person's age and abilities

Medical treatments

Medical care is tailored to each person's needs and is reviewed regularly. Some children need surgery or procedures for heart problems, gut problems, ear or eye issues. Others may need hormone treatment if the thyroid gland is underactive. Breathing problems during sleep may be managed with support such as weight management, specialist advice, or removal of tonsils and adenoids. Medicines may be prescribed for specific conditions such as infections, constipation, thyroid problems or mental health difficulties — your own doctor or pharmacist will explain what is being offered, why, and what to watch for. Therapies such as speech and language therapy, physiotherapy and occupational therapy are a key part of care throughout life.

When is surgery considered?

Surgery is only considered when there is a clear medical need. The most common reason is a heart defect found in the first months of life, which sometimes needs repair. Other possible operations include surgery for gut problems in newborns, grommets or other ear surgery for repeated ear problems, removal of tonsils and adenoids for sleep apnoea, and eye surgery for squints or cataracts. Your specialist team will explain the benefits, risks and timing, and the decision is always made together with you and the person having the operation.

Living with this condition

Day-to-day life with Down syndrome is, for most families, ordinary life with some extra planning. Routines help — visual timetables, clear instructions and plenty of time to process information make a big difference. School support plans, speech therapy sessions and regular health appointments become part of the family calendar. Many parents say the important things are celebrating small steps, building on interests and strengths, and making sure the person is included in clubs, friendships and decisions about their own life.

Lifestyle tips

• Build a steady routine with predictable mealtimes, sleep times and activities
• Use visual supports — pictures, simple checklists and step-by-step guides — at home and at school
• Encourage friendships, clubs and community groups from an early age
• Keep learning going at home with reading, counting, cooking and everyday tasks
• Plan for transitions early — moving to a new school, leaving school, moving towards work or supported living
• Make time for siblings and other family members, and accept help when it is offered
• Ask about respite care, support groups and financial help through your local health or social care service

Diet and exercise

A balanced, varied diet and regular physical activity help with weight, energy, digestion and mood. Constipation and weight gain are more common in Down syndrome, so fibre, fluids and movement are especially useful. Many people find swimming, walking, dancing, cycling and team sports enjoyable; schemes like Special Olympics or local inclusive sports clubs can be a great fit. Check with a doctor before starting a new, strenuous activity if there are heart problems or neck concerns. Anyone with Down syndrome should have their growth, weight and thyroid checked regularly.

Mental health and emotional wellbeing

People with Down syndrome can feel happy, proud, anxious, lonely and frustrated just like anyone else. Some find it hard to explain feelings, so behaviour changes may be the first sign that something is wrong — pain, hearing loss, poor sleep or a change in routine can all be behind it. Parents and siblings may feel overwhelmed, isolated or worried about the future. These feelings are valid and common. Talking to your GP, a psychologist or a support group can help, and help is available for the whole family, not just the person with Down syndrome. If you or someone you care for is in crisis or having thoughts of harming themselves, contact your local crisis support service or your local emergency number straight away.

Prevention

Down syndrome cannot be prevented. It is not caused by anything you did, ate, drank or felt during pregnancy, and no vitamin, medicine or lifestyle choice has been shown to reduce the chance. What you can do is plan and prepare: talk to your healthcare team early in pregnancy about screening options, and ask for support and information if you would like it. A healthy pregnancy — not smoking, not drinking alcohol, eating well and attending antenatal appointments — is good for every baby, but it does not change whether a baby has Down syndrome.

Screening programmes

Screening in pregnancy is offered to everyone in the UK and in many other countries. It does not give a yes-or-no answer by itself; it estimates the chance. If the chance is high, a diagnostic test can confirm it. Screening is your choice, and you can say yes or no. Screening is also offered after birth for some health problems linked to Down syndrome, such as hearing loss and heart defects, because finding them early means they can be treated early.

Complications

If left untreated

• Undiagnosed heart defects can cause breathing problems, poor growth and serious illness in babies
• Untreated hearing loss can slow speech, language and learning
• Uncorrected vision problems can affect learning, balance and confidence
• An underactive thyroid can cause tiredness, weight gain, constipation and low mood if not treated
• Untreated sleep apnoea can affect behaviour, learning and heart health
• Ongoing constipation can cause pain, poor appetite and bowel problems
• Obesity raises the risk of diabetes and joint problems
• Unstable neck joints (atlantoaxial instability) can, rarely, press on the spinal cord and need urgent medical care
• Memory changes and early Alzheimer's disease are more common with age and need sensitive assessment and support

Long-term outlook

The outlook today is very different from a few decades ago. Most people with Down syndrome live into their 60s and beyond, go to mainstream schools, take part in sport and the arts, work, form relationships and live more independently than ever before. There will be challenges, and some health problems need careful watching, but with regular health checks, good education and a supportive community, many people with Down syndrome lead full and fulfilling lives. Families often say the support they receive — and the person themselves — bring far more than they expected.

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