What Is Fetal Death Causes Risks And Diagnosis?

Fetal death is the loss of a pregnancy after about 20 weeks of gestation, before the baby is born. It is also called stillbirth. In the United States, stillbirth affects roughly 1 in 175 pregnancies, according to the Centers for Disease Control and Prevention. The causes are varied, and in many cases more than one factor is involved. Sometimes no clear cause is ever found.

What Is Fetal Death Causes Risks And Diagnosis?

Fetal death means a fetus dies in the womb at or after 20 weeks of pregnancy. Before 20 weeks, the loss is called a miscarriage. The distinction matters because the two are tracked and studied differently, and the medical evaluation after a loss differs.

Doctors divide fetal deaths into two broad groups. Early fetal death happens between 20 and 27 weeks. Late fetal death happens at 28 weeks or later. About 1 in 175 pregnancies in the US ends in stillbirth, and the rate has been slowly declining over the past two decades.

The causes fall into a few major categories: problems with the placenta, genetic or chromosomal conditions, infections, umbilical cord problems, and maternal health conditions. In a meaningful share of cases — often cited as roughly one in four to one in three — no cause is identified even after a thorough evaluation.

What Causes Fetal Death?

Placental problems are the most common identifiable cause. The placenta delivers oxygen and nutrients to the fetus. When it does not function properly, the fetus can be deprived of oxygen. Conditions like placental insufficiency, placental abruption (where the placenta separates from the uterine wall), and umbilical cord accidents account for a large portion of cases.

Genetic and chromosomal abnormalities also play a role. Some are incompatible with life. Others cause organ development problems that lead to death in the womb. These are more common in early fetal death than late.

Infections can cross the placenta and harm the fetus. These include cytomegalovirus, toxoplasmosis, listeria, and certain other bacterial and viral infections. Infection is a less common cause overall, but it is one that can sometimes be prevented or treated.

Maternal health conditions matter too. Diabetes, high blood pressure, and obesity all increase risk. So does pregnancy with more than one fetus. These conditions do not guarantee a poor outcome, but they raise the odds of complications.

In many cases, multiple factors overlap. A placenta that is already under stress may be pushed past its limit by an infection or a blood pressure spike. That is one reason it can be hard to name a single cause.

What Are the Risk Factors for Fetal Death?

Some risk factors cannot be changed. Others can be managed. Knowing them helps pregnant people and their doctors decide how closely to monitor a pregnancy.

• Advanced maternal age. Risk rises with age, particularly after 35.
• Previous stillbirth. A prior loss increases the risk in a later pregnancy.
• Obesity. A body mass index of 30 or higher is linked to higher risk.
• Diabetes and high blood pressure. Both conditions, especially when poorly controlled, raise risk.
• Multiple gestation. Carrying twins or more increases risk.
• Smoking, alcohol, and drug use. All are associated with higher risk.
• Certain infections. Some can be prevented or treated.
• Black race. In the US, stillbirth rates are substantially higher among Black women, a disparity researchers attribute largely to social and systemic factors rather than biology.

Having one or more risk factors does not mean a loss will happen. Most pregnancies with risk factors end with a healthy baby. Risk factors change probabilities, not certainties.

How Is Fetal Death Diagnosed?

Diagnosis usually starts when a pregnant person notices that fetal movement has decreased or stopped. That is not always a sign of loss — babies have quiet periods — but it is a reason to check. A doctor will listen for a heartbeat with a handheld Doppler device. If no heartbeat is found, an ultrasound is done to confirm.

Ultrasound is the definitive test. It shows whether the heart is beating and can assess the fetus’s size and position. If the ultrasound confirms no cardiac activity, the diagnosis is made.

After a loss, doctors may recommend tests to look for a cause. These can include:

• A review of the placenta by a pathologist
• Genetic testing on the fetus, sometimes using a small tissue sample
• Blood tests on the mother to check for infections, clotting disorders, or other conditions
• An autopsy, if the family consents

Even with all these tests, no cause is found in a substantial number of cases. That is not a failure of care. It reflects how many overlapping factors can contribute to a loss, and how some leave no trace that current tests can detect.

What Are the Signs and Symptoms?

The most common sign is a decrease or stop in fetal movement. Some people notice a change in the pattern of kicks or rolls. Others feel nothing at all.

Other possible signs include vaginal bleeding, cramping, or a change in discharge. These symptoms can also occur in healthy pregnancies, so they do not confirm a loss on their own.

Many fetal deaths are discovered during a routine prenatal visit when no heartbeat is found. This is why regular prenatal care matters — it creates opportunities to catch problems early.

If you are pregnant and notice decreased fetal movement, contact your doctor right away. Do not wait to see if it improves on its own. In many cases, the baby is fine, but a quick check is the only way to know.

How Is Fetal Death Managed?

After a confirmed diagnosis, the next step is delivery. The method depends on how far along the pregnancy is and the person’s medical situation. Options include inducing labor with medication or, in some cases, a surgical procedure called a dilation and evacuation.

Doctors and families usually discuss timing and method together. There is no single right approach. Some people want to deliver as soon as possible. Others need time to process the loss.

After delivery, the focus shifts to recovery and, if desired, planning for future pregnancies. Physical recovery typically takes several weeks. Emotional recovery can take much longer and often benefits from support groups or counseling.

For future pregnancies, doctors may recommend closer monitoring, more frequent ultrasounds, and sometimes medication to manage underlying conditions. The specific plan depends on what caused the loss, if a cause was found.

Can Fetal Death Be Prevented?

There is no way to guarantee prevention. But some steps can lower risk. Managing chronic conditions like diabetes and high blood pressure before and during pregnancy helps. So does avoiding smoking, alcohol, and illicit drugs.

Regular prenatal care allows doctors to track fetal growth and detect problems early. If a problem is found, it can sometimes be managed before it becomes dangerous.

For people with a prior stillbirth, some clinicians recommend additional monitoring in later pregnancy, such as fetal movement counting or non-stress tests. The evidence for how much these strategies reduce risk is mixed, and practices vary. It is a conversation worth having with a doctor who knows the full history.

What is clear is that most pregnancies — even those with risk factors — end with a healthy baby. A loss is not a sign that someone did something wrong.