IUFD stands for intrauterine fetal demise, the medical term for the death of a baby in the womb at 20 weeks of gestation or later. Before 20 weeks, pregnancy loss is classified as a miscarriage. After that threshold, it is formally called a stillbirth or IUFD. In the United States, the overall fetal mortality rate in 2023 was 5.52 per 1,000 births, a number that has remained relatively stable in recent years.
How IUFD Is Defined
Clinically, IUFD refers specifically to the death of a fetus while still inside the uterus. The 20-week cutoff is the standard dividing line between miscarriage and stillbirth in U.S. medical practice. Some international guidelines use 22 or 28 weeks, which is why global statistics on stillbirth can vary.
IUFD is further broken into two categories based on timing. Early fetal death occurs between 20 and 27 weeks of gestation, while late fetal death occurs at 28 weeks or beyond. In 2023, the early fetal mortality rate was 2.89 per 1,000 births and the late rate was 2.64 per 1,000, according to CDC data. These two windows can differ in their causes and how they are managed.
Signs That Raise Concern
The most common warning sign is a noticeable decrease or complete absence of fetal movement. If you’ve been feeling regular kicks and they slow down or stop, that change is what typically brings someone to the hospital. Other signs a provider may notice include the inability to detect a fetal heartbeat with a Doppler device and a uterus that measures smaller than expected for the gestational age.
None of these signs confirm IUFD on their own. The definitive diagnosis requires an ultrasound showing no fetal cardiac activity. If a handheld Doppler can’t pick up heart tones, an abdominal ultrasound is performed as quickly as possible to confirm what is happening.
Common Causes
One of the most difficult realities of IUFD is that a specific cause often goes unidentified. In one retrospective study of 70 term stillbirths, 61% were ultimately classified as having an unknown cause, though the researchers noted that comprehensive placental examination was only performed in about half of cases. When thorough pathology is done, including detailed microscopic evaluation of the placenta, identifiable causes can be found in over 90% of cases that would otherwise be labeled unexplained.
Among known causes, umbilical cord problems are one of the most frequent findings, accounting for roughly 27% of cases in that same study. Abnormal coiling of the cord was the single most common specific finding. Placental abruption, where the placenta separates from the uterine wall, accounted for about 7% of cases. Fetal growth restriction, gestational diabetes, severe preeclampsia, infection, and a liver condition called intrahepatic cholestasis of pregnancy each contributed smaller percentages.
Chromosomal and structural abnormalities in the fetus are also recognized causes, though pregnancies with known genetic anomalies are sometimes tracked separately in research.
Risk Factors
Preeclampsia, a pregnancy complication involving high blood pressure and organ stress, carries roughly twice the odds of IUFD compared to pregnancies without it. That makes blood pressure monitoring throughout pregnancy one of the more meaningful screening tools. Other recognized risk factors include advanced maternal age, obesity, pre-existing diabetes, and a history of prior stillbirth.
Pregnancies that extend past 41 weeks also carry elevated risk. Data from a large California study found that at 42 weeks, the combined risk of stillbirth and newborn death with continued waiting exceeded the risk associated with delivery, with rates of 17.6 versus 10.8 per 10,000 ongoing pregnancies. This is one reason providers often recommend induction around 39 to 41 weeks.
What Happens After Diagnosis
Once IUFD is confirmed, the focus shifts to delivering the baby safely. The approach depends on how far along the pregnancy is, the mother’s medical history (particularly any prior uterine surgeries), and her own preferences. For most people, this means an induced labor, where medication is used to start contractions. In earlier gestational ages, a surgical procedure may be an option. Providers walk through the risks and benefits of each approach for the specific situation.
There is generally no medical emergency requiring immediate delivery, so there is time to process the diagnosis and make informed decisions. Some people choose to deliver right away, while others need hours or even a day before they feel ready.
Finding a Cause After Delivery
After delivery, a series of evaluations can help identify why the loss happened. The most important of these is a detailed examination of the placenta, both visually and under a microscope. Placental pathology can reveal problems with blood flow, signs of infection, or structural abnormalities in the tissue that supports fetal growth.
A fetal autopsy is also recommended, though it is always a parental decision. The autopsy includes measurements, tissue sampling, and sometimes genetic testing. For parents who are uncomfortable with a full autopsy, a minimally invasive version using imaging and targeted tissue samples is sometimes available as an alternative. Additional testing may include genetic analysis, metabolic screening, and blood work from the mother to check for clotting disorders or infections. Together, these evaluations give the clearest possible picture of what went wrong and can inform planning for future pregnancies.
Emotional Support and Recovery
The physical recovery after delivering a stillborn baby is similar to recovery from any birth, but the emotional experience is profoundly different. Hospital bereavement protocols increasingly recognize this. Current guidelines emphasize letting parents spend time with their baby, using compassionate language (saying “baby” rather than “fetus”), and supporting individual choices about holding, naming, or photographing the child. Cultural and religious practices are respected as part of this process.
Shared decision-making is a central principle. Parents are given information about options like autopsy, memorial services, burial, or cremation, and supported in whatever they choose rather than directed toward a particular path. Hospitals typically arrange referrals for counseling before discharge, and follow-up appointments serve both a physical and psychological purpose. Screening for depression, anxiety, and post-traumatic stress is recommended in the weeks and months that follow, since grief after stillbirth can be intense and long-lasting. Perinatal loss support groups, both in-person and online, are among the most commonly recommended resources for ongoing support.