For many women trying to conceive after 35, miscarriage risk is one of the most emotionally charged topics they encounter. Whether from a search engine, a well-meaning friend, or a healthcare provider’s cautionary comment, women in this age group often receive information about pregnancy loss in ways that generate fear without context. Understanding what the research actually says—including both the increased risk that exists and its real-world magnitude—can help women approach this topic with accurate information rather than heightened anxiety.
This article aims to provide a clear, compassionate, and evidence-based overview of what is known about miscarriage risk after 35, what contributes to that risk, and how it is typically monitored during pregnancy. As always, this information is not a substitute for individualized guidance from your OB/GYN or midwife, who can contextualize these statistics within your specific health history.
What Research Shows About Miscarriage and Age
Research consistently shows that the risk of pregnancy loss increases with maternal age, and this is one of the more robust findings in reproductive medicine. The primary biological mechanism appears to be related to egg quality: as women age, the proportion of eggs with chromosomal abnormalities increases, and chromosomally abnormal embryos are significantly more likely to result in miscarriage.
According to data from large population studies, approximate miscarriage rates by age are as follows:
- Ages 20-24: approximately 8-10% of recognized pregnancies
- Ages 30-34: approximately 10-12%
- Ages 35-39: approximately 15-20%
- Ages 40-44: approximately 25-35%
The American College of Obstetricians and Gynecologists notes that chromosomal abnormalities account for approximately 50-70% of first-trimester pregnancy losses across all age groups, and this proportion increases with age. This is an important point of context: most miscarriages are not caused by anything the woman did or could have prevented, but reflect a chromosomally abnormal embryo that the body does not continue to develop.
What These Numbers Mean in Practice
Statistics are most meaningful when understood in context. Even at age 38, the majority of pregnancies do not end in miscarriage—the data suggest that approximately 80-85% of pregnancies in this age group continue beyond the first trimester. While the increased risk compared to younger age groups is real, framing it only as elevated risk without noting the substantial probability of an ongoing pregnancy can be misleading and unnecessarily alarming.
It’s also worth noting that these statistics describe recognized pregnancies—those confirmed by a positive pregnancy test. Some early losses occur before a woman realizes she is pregnant and are simply experienced as a late period. Including these very early losses would raise miscarriage rates across all age groups, while the relative age-related pattern would remain similar.
The Role of Chromosomal Abnormalities
As noted, the primary driver of the age-related increase in miscarriage risk is chromosomal abnormality in the embryo—most commonly errors in chromosome segregation (called aneuploidy) that occur during egg cell division. These errors become more frequent as women age, and they are not predictable from the outside. A chromosomally normal pregnancy has the same fundamental risk of miscarriage regardless of the mother’s age; it is the increased frequency of chromosomally abnormal embryos that shifts the overall statistics.
Preimplantation genetic testing (PGT-A), used in IVF cycles, allows embryos to be screened for chromosomal abnormalities before transfer. For women over 35 who are undergoing IVF, PGT-A can increase the likelihood that the transferred embryo is chromosomally normal—and thereby reduce the risk of miscarriage from that specific pregnancy. However, PGT-A is not used in natural conception, and it does not “fix” the underlying biological pattern of egg quality.
Recurrent Pregnancy Loss
Recurrent pregnancy loss (RPL)—typically defined as two or three or more consecutive pregnancy losses—is a distinct clinical situation that warrants thorough evaluation regardless of age. The causes of RPL are varied and may include chromosomal issues with the parents’ own chromosomes (structural rearrangements), uterine structural abnormalities, immunological factors, hormonal disorders, and other conditions—many of which can be identified and addressed.
If you have experienced two or more pregnancy losses, discussing a comprehensive RPL evaluation with a reproductive endocrinologist or a specialist in recurrent pregnancy loss is an important step. Effective interventions exist for many causes of RPL, and having a thorough evaluation is different from simply accepting that loss is inevitable.
Our article on the emotional journey of trying to conceive after 35 addresses some of the psychological dimensions of navigating pregnancy loss, which can be a profoundly difficult experience.
Prenatal Screening and the Question of Chromosomal Abnormalities
Beyond miscarriage, age-related increases in chromosomal abnormalities are also associated with increased rates of certain chromosomal conditions in ongoing pregnancies, most notably Down syndrome (trisomy 21). The risk of Down syndrome in recognized pregnancies increases from approximately 1 in 1,000 at age 30 to approximately 1 in 400 at age 35 and 1 in 100 at age 40, according to published data.
For this reason, comprehensive prenatal genetic screening is routinely offered and discussed with women who become pregnant at 35 or older. Options include:
- Cell-free DNA (cfDNA) screening/NIPT: A blood test, typically done after 10 weeks, that screens for common chromosomal conditions with high sensitivity. A positive result is not diagnostic—it indicates increased risk and warrants confirmatory testing.
- First-trimester combined screening: An ultrasound (nuchal translucency measurement) combined with blood markers, providing a risk estimate for chromosomal abnormalities.
- Diagnostic testing (CVS or amniocentesis): Invasive procedures that provide definitive chromosomal information; carried a small procedural risk of pregnancy loss (approximately 0.1-0.5% depending on procedure and facility).
Decisions about which screening or diagnostic tests to pursue are deeply personal and involve considerations of values, risk tolerance, and what you would want to know. Your OB/GYN or genetic counselor can help you navigate these options without pressure in either direction. The American College of Obstetricians and Gynecologists offers accessible patient information on these options.
Factors Other Than Age That Influence Miscarriage Risk
Age is a significant but not the only factor influencing miscarriage risk. Other factors that research associates with increased pregnancy loss risk include:
- Prior pregnancy loss history
- Certain uterine abnormalities (fibroids in certain locations, uterine septum)
- Autoimmune conditions such as antiphospholipid syndrome
- Poorly controlled thyroid dysfunction or diabetes
- Smoking
- Body mass index at the extremes
Many of these factors can be identified through pre-conception evaluation or early pregnancy assessment, and some are modifiable. Our article on preconception health planning after 35 covers the components of a pre-pregnancy health evaluation in more depth.
Frequently Asked Questions
Does having a miscarriage after 35 mean I will have another one?
No. Most women who experience a miscarriage—even after 35—go on to have successful subsequent pregnancies. A single miscarriage, while emotionally painful, does not typically indicate an underlying problem that warrants extensive investigation. Two or more consecutive losses generally prompt a more thorough evaluation to look for identifiable contributing factors.
Is there anything I can do to reduce my miscarriage risk?
For most miscarriages—which are driven by chromosomal factors in the embryo—there is nothing that could have prevented the loss, and nothing that the woman did caused it. Maintaining general health, managing chronic conditions like diabetes or thyroid disease before conception, not smoking, and maintaining a healthy weight are the factors most associated with overall pregnancy health. No supplement or dietary change has been shown to reliably prevent chromosomally-driven miscarriage.
When should I start trying again after a miscarriage?
Most OB/GYNs advise waiting until one full menstrual cycle has passed after a miscarriage before trying again, primarily to allow for dating of a subsequent pregnancy. Some research suggests that conception in the cycle immediately following a miscarriage may not carry higher risk for the next pregnancy, but this is worth discussing with your individual provider. Emotionally, readiness to try again varies widely, and taking the time you need is entirely valid.
Does stress cause miscarriage?
Research does not support the idea that normal life stress causes miscarriage. The vast majority of miscarriages are attributable to chromosomal factors in the embryo. While severe, sustained physiological stress may theoretically influence hormonal balance, everyday emotional stress—including the stress of the trying-to-conceive journey itself—is not a known cause of pregnancy loss. Releasing misplaced guilt or self-blame is an important part of emotional recovery after loss.
Key Takeaways
- Miscarriage risk increases with age, primarily due to higher rates of chromosomal abnormalities in eggs—but most pregnancies at 35-39 do not end in miscarriage.
- The majority of first-trimester miscarriages reflect chromosomally abnormal embryos, not anything the woman did or could have prevented.
- Recurrent pregnancy loss (two or more losses) warrants thorough evaluation by a specialist—effective treatments exist for many identifiable causes.
- Comprehensive prenatal screening for chromosomal conditions is routinely offered and discussed with women pregnant at 35 or older, with multiple non-invasive and diagnostic options available.
- Most women who experience one miscarriage go on to have successful pregnancies; emotional support during and after loss is an important part of the journey.
Medical Disclaimer
This content is for informational purposes only and does not constitute medical advice. Individual health situations vary significantly. Always consult a qualified healthcare provider before making decisions related to your health, fertility, or pregnancy.
About the Author
Emily Carter is a women’s health writer focused on fertility, pregnancy after 35, and sleep changes in midlife. She writes research-informed, non-alarmist content to help women navigate reproductive and hormonal transitions with clarity and confidence.