“Born sleeping” is a gentle way of saying a baby was stillborn, meaning the baby died in the womb or during labor after reaching a stage of pregnancy where survival outside the womb would otherwise have been possible. In the United States, stillbirth is typically defined as a fetal death at or after 20 weeks of gestation; the World Health Organization uses a threshold of 28 weeks for international comparisons. The causes range from placental failure and umbilical cord problems to infections, genetic conditions, and complications of maternal health, though in a meaningful number of cases no definitive cause is ever found.
Why the Phrase Exists
Parents, bereavement organizations, and increasingly hospital staff use “born sleeping” because it acknowledges the baby as a person while softening language that can feel clinical or blunt. A family announcing a stillbirth may say their child was “born sleeping” or was “born still” to communicate their loss in a way that feels accurate to their experience: they went through labor or delivery and met their baby, but their baby was not alive. The phrase also helps make the subject more approachable in conversations where words like “dead” or “deceased” can feel jarring.
How Common Is Stillbirth
In high-income countries, the overall stillbirth rate is roughly 3 to 6 per 1,000 births, though it varies by population and how stillbirth is defined. Developed countries average about 6 per 1,000 total births, compared with roughly 21 per 1,000 in developing countries.1PubMed. The relationship of intrapartum and antepartum stillbirth rates to measures of obstetric care in developed and developing countries In the United States, the rate sits around 4 to 5 per 1,000 births depending on the year. That means roughly 1 in every 200 pregnancies that reach 20 weeks ends in stillbirth. Because most stillbirths happen before labor begins, the medical term you’ll often see is “antepartum” stillbirth, as opposed to “intrapartum” stillbirth, which occurs during labor itself. In developed countries, the fraction of stillbirths occurring during labor is relatively small, around 16%, whereas in developing countries it climbs to about 31%.1PubMed. The relationship of intrapartum and antepartum stillbirth rates to measures of obstetric care in developed and developing countries
The Most Common Causes
Stillbirth is rarely a single-cause event. Investigations often uncover overlapping factors, and the relative weight of each can be hard to untangle. That said, the causes that show up most consistently in research fall into a few broad categories.
Placental Problems
The placenta is the baby’s lifeline, delivering oxygen and nutrients from the mother’s blood supply. When the placenta fails, the consequences for the baby can be fatal. In one large study of 512 stillbirths, about 24% were attributed to placental disease, with the most common specific findings being blood clots within the fetal vessels and areas of tissue death from restricted blood flow.2PubMed Central. Findings in Stillbirths Associated With Placental Disease A separate autopsy-based study found placental problems to be the leading cause of death in 28% of cases, with problems in the mother’s blood supply to the placenta being the single most frequent finding.3PubMed Central. Identifying causes and associated factors of stillbirths using autopsy of the fetus and placenta
Fetal Growth Restriction
When a baby is not growing as expected, the risk of stillbirth rises sharply. A large population-based study found that the stillbirth rate was about 17 per 1,000 among pregnancies with fetal growth restriction, compared with roughly 2.4 per 1,000 in pregnancies where the baby was growing normally. The risk was even worse when growth restriction went undetected during pregnancy: the stillbirth rate nearly doubled to about 20 per 1,000 in those cases, compared with about 10 per 1,000 when clinicians caught the problem and could intervene.4BMJ. Maternal and fetal risk factors for stillbirth: population based study This is one of the clearest examples of where prenatal monitoring can make a real difference.
Umbilical Cord Complications
Problems with the umbilical cord account for about 19% of stillbirths with a complete cause-of-death analysis, according to one study of nearly 500 cases. The most common issues were compromised blood flow through tiny vessels in the cord, cord entanglement, and knots or twisting of the cord.5PubMed Central. Umbilical Cord Abnormalities and Stillbirth True knots in the umbilical cord are actually fairly common, but for a knot to tighten enough to cut off blood flow and cause death before labor is rare.6JAMA. TRUE KNOT OF UMBILICAL CORD RESULTING IN FETAL DEATH: REPORT OF A CASE
Genetic and Chromosomal Abnormalities
Roughly 10 to 20% of stillbirths are attributed to chromosomal problems.7PubMed Central. Causal Genetic Variants in Stillbirth These can include conditions where the baby has extra or missing chromosomes, or single-gene mutations that prevent normal development. In many of these cases, the genetic problem was present from conception and was incompatible with survival.
Infections
Bacterial and viral infections can cross the placenta and harm the baby. Group B Streptococcus, a bacterium many women carry without symptoms, accounts for an estimated 1% of stillbirths in developed countries and about 4% in sub-Saharan Africa.8PubMed Central. The Burden of Group B Streptococcus Worldwide for Pregnant Women, Stillbirths, and Children Parvovirus B19, the virus behind “fifth disease” in children, can also cross the placenta and cause severe anemia in the fetus, sometimes leading to fetal death, especially during the second trimester.9PubMed. Unexpected intrauterine fetal death in parvovirus B19 fetal infection Other infections linked to stillbirth include cytomegalovirus, listeria, and syphilis, among others.
Maternal Health Conditions and Risk Factors
Certain health conditions in the mother increase the risk of stillbirth. Preexisting diabetes is among the most significant. A large Australian cohort study found that mothers with preexisting diabetes had roughly 2.7 times the risk of stillbirth compared with mothers without diabetes, and the risk was even higher when babies were very large for their gestational age.10Diabetes Care. Maternal Diabetes, Fetal Growth, and Stillbirth Risk: A Population-Wide Retrospective Cohort Study From Victoria, Australia Stillbirths among women with diabetes are also more likely to involve high blood pressure disorders and to occur later in pregnancy.11PubMed Central. Characteristics of Stillbirths Associated With Diabetes in a Diverse U.S. Cohort
Gestational diabetes, which develops during pregnancy and resolves afterward, presents a more complicated picture. A recent meta-analysis found that in high-income countries, a diagnosis of gestational diabetes was actually associated with somewhat lower odds of stillbirth, probably because the diagnosis triggers closer monitoring and earlier delivery when needed. In lower-income countries, where monitoring resources may be thinner, that protective pattern disappeared.12eClinicalMedicine. Gestational diabetes and stillbirth: a systematic review and meta-analysis The takeaway is that the diabetes itself may matter less than whether it is caught and managed.
Other maternal risk factors include high blood pressure (whether preexisting or pregnancy-related), obesity, advanced maternal age, smoking, and substance use. Many of these overlap, so disentangling each one’s independent contribution is difficult.
Modifiable Risks Worth Knowing About
Not all stillbirth risk factors are fixed. A few are things you can actually change, and one of the more surprising ones is sleep position. An individual participant data meta-analysis combining several studies found that going to sleep lying on your back was associated with about 2.6 times the odds of late stillbirth compared with sleeping on the left side. The right side carried no additional risk. The researchers estimated that back-sleeping accounted for about 6% of late stillbirths at a population level.13EClinicalMedicine. An individual participant data meta-analysis of maternal going-to-sleep position, interactions with fetal vulnerability, and the risk of late stillbirth A smaller study from Sydney found an even higher risk estimate, particularly when the baby was already growth-restricted.14PubMed. Sleep position, fetal growth restriction, and late-pregnancy stillbirth: the Sydney stillbirth study The mechanism is thought to involve the weight of the uterus compressing the major blood vessel that returns blood to the heart, reducing blood flow to the placenta. This is why many clinicians now advise pregnant women in the third trimester to fall asleep on their side.
Air pollution is another environmental factor that has drawn attention. A large cohort study from coastal China found that for every 10-microgram-per-cubic-meter increase in fine particulate matter, the stillbirth rate rose by about 14% across the full pregnancy.15PubMed. Ambient air pollution and the risk of stillbirth: a population-based prospective birth cohort study in the coastal area of China Sulfur dioxide exposure has also been linked to increased stillbirth risk.16PubMed Central. Effect of ambient air pollution and temperature on the risk of stillbirth: a distributed lag nonlinear time series analysis Individual control over air quality is limited, of course, but these findings reinforce that stillbirth is not purely a matter of individual health choices.
What Happens After a Stillbirth Is Discovered
Most stillbirths are diagnosed when the baby’s heartbeat can no longer be detected, often after the mother notices a change in fetal movement. Once a stillbirth is confirmed by ultrasound, labor is usually induced so the mother delivers vaginally, though cesarean delivery is sometimes necessary. Many parents are surprised to learn they will go through labor knowing their baby has already died. This is standard medical practice because vaginal delivery carries fewer physical risks for the mother, but it is understandably distressing.
Parents are typically offered the chance to see, hold, and spend time with their baby. Many hospitals provide memory boxes with footprints, photographs, and a small blanket. How much time families want varies enormously, and there is no right or wrong approach. Bereavement care in hospitals is inconsistent, though. A U.S. survey found that only about a third of hospitals reported having staff with protected time for perinatal bereavement care, and of 17 bereavement topics, just six were routinely offered by at least two-thirds of hospitals. Financial limits and staff shortages were the biggest barriers, especially at smaller hospitals.
Investigating the Cause
Doctors will typically recommend a post-mortem examination of the baby and the placenta. This is voluntary, and many parents find the decision difficult. But the evidence strongly supports the value of these investigations. In one study, examining the placenta alone identified a probable cause of death in 61% of cases, and adding a full autopsy raised that figure to 74%.17PubMed. Stillbirth evaluation: a stepwise assessment of placental pathology and autopsy Another study found that autopsy provided the exact cause in about 58% of cases, with placental insufficiency and cord complications being the most common findings.18PubMed. Identification of causes of stillbirth through autopsy and placental examination reports Even when no single cause is identified, the investigation can rule out certain conditions and help guide care in a future pregnancy.
Despite these investigations, about 28% of stillbirths remain unexplained even after thorough autopsy and placental analysis.3PubMed Central. Identifying causes and associated factors of stillbirths using autopsy of the fetus and placenta This is one of the most difficult aspects for families. Not knowing why their baby died can complicate both grieving and planning for the future.
The Emotional Aftermath
Stillbirth carries a psychological toll that research consistently shows is more severe and longer-lasting than many people expect. A systematic review found heightened short- and long-term levels of depression, anxiety, and post-traumatic stress disorder in parents after stillbirth compared with parents who had live births.19PubMed Central. Depression, anxiety, PTSD, and OCD after stillbirth: a systematic review Compared with early miscarriage, stillbirth produced significantly higher levels of grief and trauma symptoms, with medium-to-large effect sizes across multiple measures.20PubMed Central. Comparing posttraumatic growth in mothers after stillbirth or early miscarriage
Partners, grandparents, and siblings are affected too, though research has focused overwhelmingly on mothers. Fathers often report feeling pressure to be “the strong one” and may receive less social support. One complicating factor is that stillbirth remains poorly understood socially. Friends and coworkers may not know how to respond, or may minimize the loss because they never met the baby. This isolation can deepen the grief.
Racial and Economic Disparities
Stillbirth does not affect all communities equally, and the disparities are stark. In the United States, non-Hispanic Black mothers experience stillbirth at more than twice the rate of non-Hispanic White mothers. One recent study found a rate of 9.1 per 1,000 births among Black mothers, compared with 3.8 per 1,000 among White mothers.21PubMed Central. Racialized Economic Segregation and Disparities in the Risk of Stillbirth Hispanic and American Indian/Alaska Native mothers fall in between. This pattern has persisted for decades, with earlier data from 2005 showing similarly wide gaps.22PubMed. Racial and ethnic disparities in United States: stillbirth rates, trends, risk factors, and research needs
The causes of the disparity are complex. A decomposition analysis found that maternal age, education, pre-pregnancy weight, smoking, and neighborhood economic conditions explained only about 21% of the gap between Black and White mothers.21PubMed Central. Racialized Economic Segregation and Disparities in the Risk of Stillbirth That means nearly 80% of the disparity remains unexplained by the factors researchers measured, pointing toward systemic issues like differences in the quality of prenatal care, chronic stress from discrimination, and unequal access to high-risk obstetric services.
Pregnancy After Stillbirth
Most parents who experience a stillbirth can and do go on to have healthy babies. But the next pregnancy is rarely a straightforward experience, either medically or emotionally.
On the medical side, care in a subsequent pregnancy is tailored to whatever caused or may have contributed to the previous loss. When a mother had growth restriction in the prior pregnancy, serial ultrasounds to track the baby’s growth and blood-flow studies of the placenta are standard. When diabetes was a factor, tight blood sugar control with frequent monitoring and planned timing of delivery are recommended. Low-dose aspirin may be used for mothers at high risk of placental blood-flow problems.23PubMed. Management of subsequent pregnancy after antepartum stillbirth. A review A multidisciplinary team approach, combining obstetric, psychological, and specialist care, is considered ideal.24The Obstetrician & Gynaecologist. Care in pregnancies subsequent to stillbirth or perinatal death
On the emotional side, the next pregnancy can be grueling. Women pregnant after a stillbirth report anxiety at rates around five times higher than women with no history of loss, and depression at roughly twice the rate.25PubMed Central. Anxiety, depression and relationship satisfaction in the pregnancy following stillbirth and after the birth of a live-born baby: a prospective study PTSD symptoms during the subsequent pregnancy are common and tend to be more severe when conception occurs soon after the loss.26PubMed. Incidence, correlates and predictors of post-traumatic stress disorder in the pregnancy after stillbirth The anxiety and depressive symptoms do tend to ease as the pregnancy progresses, but they remain elevated compared with women who have not experienced a loss.27PubMed Central. Measures of anxiety, depression and stress in the antenatal and perinatal period following a stillbirth or neonatal death: a multicentre cohort study Extra emotional support and, when needed, professional mental health care during a pregnancy after stillbirth are not optional extras; they are part of responsible prenatal care.
Leave Policies and Legal Recognition
One of the more overlooked aspects of stillbirth is how institutions treat it compared with a live birth. In many countries, a mother who delivers a stillborn baby is entitled to significantly less time off than one who delivers a living child, or in some cases no bereavement leave at all. A scoping review of 49 low- and middle-income countries found that while all had some national maternity leave policy, fewer than 20% had any provision for leave after stillbirth. Among the countries that did offer post-stillbirth leave, the average was about 50 days, less than half the 108-day average for maternity leave following a live birth in those same countries. The situation varies widely in high-income countries too. Some U.S. states have begun enacting stillbirth-specific leave protections, but there is no federal standard, and many families find themselves navigating a patchwork of employer policies and short-term disability claims while grieving.
Machine Learning and Emerging Prediction Tools
One of the frustrations of stillbirth research is that many of the known risk factors are vague or hard to act on individually. A mother’s age, weight, and medical history raise her statistical risk, but they don’t tell a clinician much about what will happen in a specific pregnancy. Researchers have started exploring whether machine learning models can do better by combining many variables at once. One study tested several algorithms on a large dataset and found that a model using data available before the baby reached viability achieved about 85% accuracy in distinguishing pregnancies that ended in stillbirth from those that did not, with sensitivity and specificity both in the mid-80s.28PubMed Central. Identifying risk of stillbirth using machine learning A model using data collected throughout the full pregnancy performed similarly for overall accuracy but caught a higher proportion of actual stillbirths, with sensitivity above 92%.
These numbers sound promising, but they come with heavy caveats. The models have not been validated in large, prospective clinical trials. A false-positive rate around 15% would mean flagging a substantial number of healthy pregnancies as high-risk, leading to unnecessary interventions and anxiety. And no model can replace the clinical judgment needed to decide what to do once a pregnancy is flagged. Still, this research reflects a broader push to move stillbirth prevention from reactive care to proactive risk stratification, and the field is likely to produce clinically usable tools within the next decade.