Edwards Syndrome

Overview

Edwards syndrome, also called trisomy 18, is a rare genetic condition. It happens when a baby has an extra copy of chromosome 18. Chromosomes are the instruction books inside our cells. An extra copy can affect how the body grows and develops, and it often causes serious health problems.

It is rare. Edwards syndrome affects about 1 in 5,000 to 1 in 6,000 babies born. Many pregnancies with Edwards syndrome do not continue to birth.

It can happen in any pregnancy and any family. It is not caused by race, income, or lifestyle. Higher maternal age raises the chance, but Edwards syndrome can happen in mothers of any age.

Symptoms

Common symptoms

• Before birth, an ultrasound may show growth problems, extra fluid, or heart defects.
• Low birth weight and slow growth.
• Feeding difficulties, weak suck, or trouble swallowing.
• Breathing problems or pauses in breathing.
• Heart defects, which are common.
• A weak cry and low muscle tone.
• Distinctive physical features, such as a small jaw, clenched hands, or unusual foot shape.
• Developmental delay and learning disability.

Symptoms in children

• Babies may be very small and have trouble feeding or gaining weight.
• Some babies need help with breathing or have heart problems.
• Children who survive may have significant developmental delay and need lifelong support.
• Seizures and infections can happen more often.
• Many children need help with movement, communication, and daily care.

Symptoms in older adults

• Edwards syndrome is present from birth, so there is no separate pattern in older adults.
• Survival into adulthood is very rare. Adults who survive usually need lifelong care and support.
• Care should be planned with a specialist team who knows the person's individual needs.

Causes

Main causes

• A random extra copy of chromosome 18 happens at conception, usually in the sperm or egg.
• In some cases, only some cells have the extra chromosome. This is called mosaicism.
• In some cases, only part of chromosome 18 is extra. This is called partial trisomy.
• It is not caused by anything the parents did or did not do.

Risk factors

• Higher maternal age.
• A previous pregnancy with trisomy 18.
• A family history of chromosome changes, which is rare.

When to see a doctor

See a doctor urgently if:

• A newborn or young baby with a fever.
• Feeding problems, poor weight gain, or signs of dehydration.
• New breathing problems, heart symptoms, or seizures.
• A pregnancy with concerns about the baby's growth or development.

Book a routine appointment if:

• Before or after a diagnosis, to talk with a genetic counselor.
• To plan feeding, breathing, heart, and developmental support.
• To ask about therapy, respite care, or financial help.
• To check routine vaccines and childhood health checks.

Diagnosis

Edwards syndrome may be suspected before birth from ultrasound or screening tests. It is confirmed with a chromosome test. After birth, a physical exam and a blood test can confirm it.

Tests that may be done

• Prenatal screening blood tests and ultrasound.
• Amniocentesis — a small sample of fluid around the baby is tested.
• Chorionic villus sampling (CVS) — a small sample of the placenta is tested.
• After birth, a blood test called a karyotype or chromosome microarray.
• Heart, kidney, and other checks to look for health problems.

What to expect at your appointment

You may meet a genetic counselor and a team that includes newborn, heart, feeding, and palliative care specialists. They will explain the results and choices without judgment.

Treatment

There is no cure for Edwards syndrome. Care focuses on the baby's comfort, feeding, breathing, heart needs, and quality of life. Every family's choices are respected.

Self-care at home

• Keep a simple record of feeds, wet nappies, breathing, and symptoms.
• Ask for a written care plan and clear emergency contacts.
• Accept help and rest when you can.
• Ask about respite care and counseling for caregivers.
• Call the care team early if something changes.

Medical treatments

Support may include help with feeding, including feeding tubes; breathing support; heart monitoring; seizure care; physical, speech, and feeding therapy; and comfort-focused palliative care. Medicines may be used for comfort, infections, or other problems as decided by the care team. No specific medicine or dose is right for everyone; your care team will decide what is safe.

When is surgery considered?

Some babies with heart defects may be offered heart surgery after a specialist team reviews the risks and benefits. Not every baby is well enough for surgery. Some families choose comfort-focused care. These are personal decisions made with the medical team.

Living with this condition

Daily life can involve frequent appointments, feeding support, therapies, and watching for breathing or heart changes. Some children need round-the-clock care. Plan for breaks and ask relatives or services for help.

Lifestyle tips

• Wash hands often and ask visitors to stay away if they are sick.
• Follow safe sleep advice for babies.
• Keep a care notebook and a list of who to call.
• Use respite care and ask about financial or transport help.
• Connect with other families if you want to.

Diet and exercise

Feeding is often the biggest challenge. A feeding specialist can help with breast or bottle feeding, thickened feeds, or tube feeding. Gentle physiotherapy and movement can help with stiffness and development. Follow your child's own plan and do not force feeds or exercise.

Mental health and emotional wellbeing

Parents and caregivers may feel shock, grief, fear, anger, or isolation. Brothers and sisters may need extra support too. These feelings are normal. Ask your team for counseling. If you or someone you love is in crisis, contact your local emergency number or a local crisis service right away.

Prevention

Edwards syndrome cannot be prevented. It is caused by a random chromosome change at conception, not by anything a parent did. Genetic counseling can help you understand the chances in future pregnancies.

Vaccines

Keep up with routine vaccines recommended by your child's healthcare team and local schedule. Ask them about protection against common infections.

Screening programmes

Prenatal screening and ultrasound can show signs of Edwards syndrome. Diagnostic tests can confirm it. Screening is a choice; talk with your provider about what is right for you.

Complications

If left untreated

• Severe feeding problems and poor growth.
• Breathing problems and lung infections.
• Heart defects and heart failure.
• Developmental disability, seizures, and movement problems.
• Higher risk of death before birth or in early infancy.

Long-term outlook

The outlook is different for every child. Many pregnancies with Edwards syndrome end in miscarriage or stillbirth, and many babies die in the first year. Some children live longer, especially with mosaic or partial forms. Supportive care can improve comfort and quality of life. Your team can help you understand what to expect.

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