Fetal demise is a medical term for the death of a fetus during pregnancy. It most commonly refers to a loss that occurs at 20 weeks of gestation or later, though the term can technically apply at any stage. When a fetal demise happens after 20 weeks, it is also called a stillbirth. Before 20 weeks, the same type of loss is usually classified as a miscarriage (or spontaneous abortion in clinical language). In the United States, the fetal mortality rate is approximately 5.4 per 1,000 pregnancies that reach 20 weeks or beyond.
How Fetal Demise Is Defined
The National Center for Health Statistics defines fetal death as the delivery of a fetus showing no signs of life: no breathing, no heartbeat, no pulsation of the umbilical cord, and no voluntary muscle movement. This distinguishes it from brief, reflexive contractions or gasps that can sometimes occur but do not indicate a living baby.
The 20-week threshold is widely used, but it is not universal. Some states define fetal demise by fetal weight instead, using a cutoff of 350 grams or more, which corresponds roughly to the average weight at 20 weeks. If your medical records or a healthcare provider used the term, it almost certainly means the pregnancy was lost at or after this point. “Stillbirth” and “fetal demise” mean the same thing, and stillbirth is the term most families and parent support organizations prefer.
Within stillbirth, doctors further distinguish by timing. An early stillbirth occurs between 20 and 27 weeks of gestation. A late stillbirth occurs between 28 and 36 weeks. A loss at 37 weeks or later is classified as a term stillbirth.
How It Is Diagnosed
The first sign that something may be wrong often comes from the pregnant person noticing a significant decrease or complete absence of fetal movement. Other symptoms that can accompany a fetal demise include vaginal bleeding or discharge, abdominal pain, and pelvic pressure. In some cases, there are no noticeable symptoms at all, and the loss is discovered during a routine prenatal visit.
If a healthcare provider cannot detect fetal heart tones with a handheld Doppler device, the next step is an ultrasound. Fetal demise is confirmed by visualizing the fetal heart and seeing no cardiac activity. This is the definitive diagnostic tool. For earlier losses (before about 13 weeks), specific ultrasound measurements help ensure the diagnosis is accurate. A gestational sac measuring at least 21 millimeters with no visible embryo, or an embryo measuring at least 5 millimeters with no heartbeat, are considered definitive findings. When initial results are uncertain, a follow-up ultrasound is typically performed 7 to 10 days later to confirm.
A slow fetal heart rate (under 100 beats per minute at 5 to 7 weeks) or bleeding beneath the membranes surrounding the embryo are concerning signs but are not enough on their own to confirm a loss. These findings prompt close monitoring rather than an immediate diagnosis.
Common Causes
In many cases, the exact cause of a fetal demise cannot be determined. When a cause is identified, it typically falls into a few broad categories. Problems with the placenta are among the most common. The placenta can separate from the uterine wall too early, develop blood flow problems, or fail to deliver enough oxygen and nutrients. Umbilical cord complications, such as a compressed or knotted cord, can also cut off the fetal blood supply.
Chromosomal or genetic abnormalities in the fetus account for another significant portion of losses, particularly earlier ones. Maternal health conditions play a role as well. Uncontrolled diabetes, severe high blood pressure, preeclampsia, blood clotting disorders, and certain infections all increase the risk. In some pregnancies, the fetus may have a structural birth defect incompatible with survival. For roughly a quarter to half of stillbirths, no clear cause is ever found despite thorough evaluation.
What Happens After a Diagnosis
Once fetal demise is confirmed, the pregnancy will need to end through delivery. The method and timing depend on how far along the pregnancy was, the person’s medical history, and their preference. For losses in the first trimester or early second trimester, three options are typically offered: waiting for the body to pass the pregnancy on its own (expectant management), medication to help the uterus empty, or a surgical procedure. Each approach has trade-offs in terms of timing, physical experience, and completeness.
For losses later in pregnancy, labor is usually induced with medication so the baby can be delivered vaginally. This process can take hours to a full day or more depending on the circumstances. Cesarean delivery is generally reserved for situations where there is a medical reason, such as a prior uterine surgery that makes labor risky. Your care team will discuss the options and what to expect with each approach.
One important medical consideration is that when a fetus is retained in the uterus for an extended period after death, there is a risk of a serious clotting disorder that can lead to heavy bleeding and other complications. This is rare, but it is one reason providers typically recommend delivery within a reasonable timeframe rather than waiting indefinitely.
Physical Recovery
Physical recovery after a fetal demise follows a timeline similar to any delivery, though the emotional weight makes it a very different experience. The body generally takes four to six weeks to heal. Vaginal bleeding is normal during this period, often including clots or gushes of blood in the first week. The bleeding typically lightens after two to three weeks and gradually shifts from bright red to pink to brown as the uterus returns to its pre-pregnancy size. Cramping can last up to 10 days as the uterus contracts back down.
Breast milk typically comes in two to five days after delivery, regardless of whether the baby survived. This can be deeply distressing. If you want to suppress milk production, the general guidance is to avoid pumping or expressing milk. The pressure and discomfort from engorgement usually peak over three to four days, though it can last up to 10 days. Small amounts of milk may continue to appear for several months as the body gradually reabsorbs it.
Pregnancy hormones take time to leave the body, so a pregnancy test may still read positive for several weeks after delivery. Hormonal shifts after the loss can also contribute to intense sadness and mood changes on top of the grief itself. These physical hormonal effects are temporary, but there is no fixed timeline for the emotional recovery that follows a fetal demise.