Understanding Edwards Syndrome (Trisomy 18): Symptoms, Causes, and What Parents Need to Know

Expecting a baby brings immense joy and hope to your family, doesn't it? Yet, facing unexpected health news during pregnancy can feel overwhelming and deeply frightening. If you or someone you love received a diagnosis or suspect a genetic condition, you are not alone in this journey. Let's talk openly and step-by-step about what this means, how doctors investigate it, and what kind of compassionate care is available.

Today, we will explore Edwards Syndrome, also widely known as Trisomy 18. Remember we talked about wanting clear answers? We are going to break down complex medical terms into plain, everyday English so you can truly understand what happens, how doctors diagnose it, and what kind of support exists for your baby and your family. Pretty helpful to have a clear picture, right?

What Is Edwards Syndrome?

Edwards Syndrome is a serious genetic condition that severely affects how a baby's body grows and develops in the womb. Babies born with this condition usually have a very low birth weight, distinct physical features, and multiple congenital birth defects. Hearing this diagnosis can cause immense sadness, confusion, and fear—and it is completely normal to feel that way. Learning more about the condition with your family doctor or primary care physician (PCP) can help you navigate this difficult time.

Who Can Get Edwards Syndrome?

Have you ever wondered who might be affected by this condition? The truth is that Edwards Syndrome can affect the pregnancy of any parent. It occurs purely by chance when an extra copy of the 18th chromosome forms in the baby's cells. You cannot predict it beforehand, and research shows it does not run in families in a predictable way.

While the chance of having a baby with this condition rises slightly if the mother is over age 35 when pregnant, it can happen at any maternal age. Just think about it: if one pregnancy is affected, the chance of it happening again in a future pregnancy remains very low, staying under 1 percent. Makes sense, right?

How Common Is Edwards Syndrome?

Among babies born alive, Edwards Syndrome occurs in about 1 out of every 5,000 to 6,000 births. During pregnancy, doctors detect it slightly more often—in about 1 out of every 2,500 pregnancies. Sadly, because of severe complications linked to this condition, at least 95 percent of affected pregnancies unfortunately end in miscarriage or stillbirth before birth.

When Was Edwards Syndrome Discovered?

Medical researchers first identified this condition back in 1960. John Hilton Edwards and his research team studied a newborn baby who displayed multiple physical birth defects and severe developmental delays. The team discovered that an extra third copy of the 18th chromosome, known scientifically as Trisomy 18, was responsible for these profound health challenges.

What Are the Symptoms of Edwards Syndrome?

Signs of Edwards Syndrome appear both before and after birth. The main features include slow physical growth, multiple birth defects, and severe developmental delays or learning disabilities. Let's look closer at how these signs show up during different stages.

Signs Visible During Pregnancy

During your routine prenatal visits, your obstetrician or midwife might check for specific markers on ultrasound scans. Some of these signs include:

• Very low physical movement or activity of the fetus inside the womb.
• Only one single umbilical artery in the cord instead of the usual two.
• A noticeably small placenta.
• Visible physical structural differences or birth defects.
• A high level of amniotic fluid surrounding the baby, medically known as polyhydramnios.

Signs Visible After Birth

After a baby is born, doctors and neonatal nurses look for specific physical signs that point toward Edwards Syndrome:

• Low muscle tone, or hypotonia, making the baby feel very floppy when held.
• Ear lobes positioned lower than usual on the head.
• Internal organs, such as the heart and lungs, not fully formed or working differently.
• Severe intellectual and developmental delays.
• Fingers overlapping one another and feet turning inward, known as clubfeet.
• A very small body, head, mouth, and jaw.
• A very weak cry with low response to loud sounds or environmental stimuli.

Severe Symptoms of Edwards Syndrome

Because the body does not develop fully, the complications of Edwards Syndrome are severe and often life-threatening. Common severe complications include:

• Congenital heart disease and structural kidney disease.
• Severe breathing failure and respiratory distress.
• Digestive tract and abdominal wall defects.
• Hernias.
• Spine curvature, known as scoliosis.

About 90 percent of babies born with Edwards Syndrome experience heart defects. After respiratory failure, these heart problems are the leading cause of early death in affected infants.

What Causes Edwards Syndrome?

Edwards Syndrome occurs because a baby has three copies of the 18th chromosome instead of the normal two copies. Normally, human cells contain 46 chromosomes organized into 23 pairs. These chromosomes carry our DNA, which provides instructions for how our bodies grow and function. We inherit one set from our mother and one set from our father.

During cell division in eggs and sperm cells, chromosomes are supposed to split evenly so each new cell gets 23 chromosomes. Sometimes, a chromosome pair fails to separate properly—a process called nondisjunction. Both copies go into the same egg or sperm cell. When that cell joins with another cell during fertilization, the total number becomes three. This chromosome error happens completely by chance. It is entirely random, and as we said a moment ago, nothing you did or did not do before or during pregnancy caused it.

How Do Doctors Diagnose Edwards Syndrome?

Diagnosis of Edwards Syndrome usually starts during pregnancy through routine screening. Doctors confirm the diagnosis either before birth or soon after delivery through specialized diagnostic testing. Let's look at what those tests involve.

What Tests Identify Edwards Syndrome?

If routine prenatal scans or blood work show potential signs of Edwards Syndrome, your doctor may recommend diagnostic tests to confirm the condition:

• Amniocentesis: Typically performed between weeks 15 and 20 of pregnancy, your doctor takes a small sample of amniotic fluid to check the baby's chromosomes.
• Chorionic Villus Sampling (CVS): Typically performed between weeks 10 and 13 of pregnancy, your doctor takes a tiny sample of tissue from the placenta to test for genetic conditions.
• Screening Blood Tests: After week 10 of pregnancy, a maternal blood test can check for increased risks of common chromosome conditions like Trisomy 18.

After birth, doctors can perform an echocardiogram (heart ultrasound) and other imaging tests to identify structural problems and start immediate supportive care.

How Do Doctors Treat Edwards Syndrome?

Because the condition is severe, doctors typically provide comfort care for babies born alive. Comfort care focuses on keeping the baby warm, pain-free, and comfortable in their parents' arms. Treatment plans vary for each baby based on the severity of their symptoms, as there is currently no cure for Edwards Syndrome.

Medical management options may include:

• Heart Care: Almost all babies with Trisomy 18 have heart issues. While major corrective surgery is not safe or possible for every baby, pediatric cardiologists evaluate each case individually.
• Feeding Support: Delayed physical growth makes regular feeding difficult. Babies often need a specialized feeding tube during their early days to receive proper nutrition and hydration.
• Orthopedic Care: Conditions like scoliosis can affect movement and comfort. Braces or specialized physical support help manage these issues.
• Emotional and Social Support: Families coping with Edwards Syndrome need strong support systems. Counseling helps parents process grief and navigate complex medical decisions with their healthcare team.

Can You Lower the Risk of Edwards Syndrome?

Because Edwards Syndrome results from a random genetic variation during cell division, you cannot prevent it from happening. However, if you plan future pregnancies, genetic counseling and preimplantation genetic testing with in vitro fertilization (IVF) can help reduce the chance of passing on chromosome conditions. Talk with your doctor or a genetic counselor if you have questions or concerns about future family planning.

What Happens When a Child Has Edwards Syndrome?

Edwards Syndrome has no cure, and most pregnancies unfortunately end in miscarriage or stillbirth. Among pregnancies reaching the third trimester, about 40 percent do not survive labor, and about one-third of live-born babies arrive prematurely. Survival rates for babies born alive with Edwards Syndrome are low:

• 60 to 75 percent survive their first week.
• 20 to 40 percent survive their first month.
• Fewer than 10 percent survive to celebrate their first birthday.

Babies born with Trisomy 18 require specialized medical care tailored to their unique needs. While life expectancy is very short, the small percentage of children who live past one year often bring deep love and joy to their families, even though they usually do not learn to walk or speak.

When Should You See a Doctor?

If you are pregnant and experience signs of a possible miscarriage or pregnancy complication, contact your obstetrician or visit the nearest Urgent Care or hospital emergency department right away. Warning signs include severe stomach cramps or pelvic pain, chills or fever, persistent backache, or heavy vaginal bleeding. Regular prenatal checkups are essential for monitoring your health and your baby's development.

Questions to Ask Your Doctor

When discussing genetic test results or prenatal findings with your medical team, consider asking these helpful questions:

• "What is my personal risk of having a baby with a chromosomal condition based on my screening results?"
• "What specific diagnostic tests, such as amniocentesis, are appropriate for our situation?"
• "What treatment and comfort care options are available if our baby is born with Trisomy 18?"
• "What emotional support resources and counseling services do you recommend for our family?"