Can a Woman With Turner’s Syndrome Have a Baby?

A woman with Turner syndrome can have a baby, though the path to pregnancy is more complex and medically involved than for most women. The vast majority of those with the condition experience ovarian insufficiency, meaning their ovaries cannot produce eggs on their own. But with donor eggs and careful medical preparation, about 40 percent of women with Turner syndrome who pursue oocyte donation achieve a live birth. A small minority conceive naturally, particularly those with mosaic forms of the condition. The real challenge is not just getting pregnant but staying safe during pregnancy, since Turner syndrome carries serious cardiovascular risks that require close monitoring from well before conception through delivery.

Why Turner Syndrome Affects Fertility

Turner syndrome occurs when one of the two X chromosomes is completely or partially missing. The ovaries are especially sensitive to this chromosomal difference. In a developing fetus with Turner syndrome, egg cells begin dying off at an abnormally fast rate, a process that starts before birth and continues through childhood. This accelerated loss of eggs disrupts the formation of normal ovarian follicles, and the ovaries often end up as thin, non-functional strips of tissue sometimes called “streak gonads.”¹ By the time most girls with Turner syndrome reach adolescence, few or no eggs remain, which is why spontaneous puberty and natural fertility are uncommon.

The extent of ovarian function varies depending on the specific chromosomal pattern. Women with “classic” Turner syndrome, where every cell is missing an X chromosome, tend to have the most severe ovarian failure. Those with mosaic Turner syndrome, where some cells have the typical two X chromosomes and others do not, often retain more ovarian function. In mosaic cases, the rate of egg loss slows down, and a greater proportion of cells with a normal chromosomal makeup can sustain some follicle development.² This distinction matters enormously when it comes to whether natural conception is even on the table.

Spontaneous Pregnancy Is Rare but Real

Somewhere around 2 to 5 percent of women with Turner syndrome conceive without medical assistance. Case reports document healthy newborns born to women with the classic 45,X karyotype, though this is far less common than spontaneous pregnancy in mosaic forms. In mosaic Turner syndrome, enough functioning eggs may persist into reproductive years to allow ovulation and natural conception. Some women have had multiple spontaneous pregnancies.

There is a complication worth knowing about. While mosaic Turner syndrome raises the chances of conceiving naturally, one review found that the risk of the baby having a congenital anomaly is actually higher in pregnancies from mosaic mothers compared with those from women with classic Turner syndrome.² This is one reason genetic counseling and prenatal testing are recommended regardless of how conception occurs.

Getting the Uterus Ready

Even when eggs are available through donation, the uterus itself needs attention. Many women with Turner syndrome have a smaller-than-average uterus because they never experienced the natural estrogen surge of puberty. Without adequate estrogen exposure over time, the uterus may remain immature in both size and shape, making it unable to support a pregnancy.

Hormone replacement therapy can change this. One study found that about a quarter of women with Turner syndrome had a fully mature uterus, roughly a third had an immature one, and the rest fell somewhere in between. The factors that predicted uterine maturity were a history of spontaneous puberty and the duration and type of hormone therapy, with estradiol-based treatments being most effective.³ Another study of 40 patients found that with estrogen of adequate dose and duration, a normal mature uterine size could be achieved regardless of the specific karyotype and even when hormone therapy started late.⁴

When pregnancy is actively being planned through oocyte donation, doctors often use higher-than-usual estrogen doses for extended periods to encourage uterine growth. Oral doses several times above standard replacement levels have been used for up to two years before embryo transfer.⁵ The goal is to get the uterine lining thick and responsive enough to accept and nourish an embryo. This preparation phase requires patience and regular monitoring, but it has made pregnancy possible for many women whose uteruses would otherwise not have been capable of carrying a child.

Oocyte Donation and IVF Success Rates

For most women with Turner syndrome who want to become pregnant, donor eggs are the pathway. In this process, eggs from a healthy donor are fertilized (usually with the partner’s sperm) and the resulting embryo is transferred into the prepared uterus. A large meta-analysis pooling data from 14 studies found a live birth rate of about 40 percent per patient and roughly 17 percent per embryo transfer cycle.⁶ Those numbers mean that while any single transfer has modest odds, repeated attempts give many women a good chance of eventually having a baby.

A recent retrospective study compared oocyte donation outcomes in women with Turner syndrome to those in women with other causes of premature ovarian insufficiency. The per-transfer live birth rates were similar between the two groups, at roughly 29 percent versus 27 percent. However, women with Turner syndrome had a significantly lower chance of success on their very first transfer. After three or more transfers, though, the gap disappeared.⁷ The takeaway is that persistence often pays off, and the uterine preparation that happens before and between cycles may play a role in improving implantation over time.

Because of the higher risks associated with multiple pregnancies in this population, experts recommend transferring only one embryo at a time to avoid twins.⁸ Twin pregnancies put more strain on the cardiovascular system, and as we will see, that is already the area of greatest concern.

The Cardiovascular Risk During Pregnancy

This is the part of the conversation that does not get enough attention outside of specialist clinics. Turner syndrome is the most common identified cause of aortic dissection in young women, and the risk of this life-threatening event is more than 100 times higher than in the general population of young and middle-aged women. That already elevated risk climbs further during pregnancy.⁹ Aortic dissection is a tear in the wall of the body’s largest artery. In pregnancy, increased blood volume and hormonal changes put extra stress on blood vessel walls, and in women with Turner syndrome the aorta may already be structurally vulnerable.

A systematic review identified 14 reported cases of aortic dissection associated with pregnancy in women with Turner syndrome. Ten occurred during the pregnancy or within the first month after delivery. The majority of these pregnancies had been conceived through oocyte donation, and two involved twin pregnancies. Bicuspid aortic valve and coarctation of the aorta were the most common associated heart abnormalities among these women, and more than half had some degree of aortic widening. Two women had no identifiable risk factors at all.¹⁰ Those last two cases are a sobering reminder that even thorough screening cannot eliminate risk entirely.

Beyond aortic problems, pregnancy in Turner syndrome also carries higher rates of preeclampsia, liver issues, thyroid disease, type 2 diabetes, and cesarean delivery.¹¹ One study found that pregnant women with Turner syndrome were about 1.5 times more likely to deliver by cesarean section than the general pregnant population.¹² Preeclampsia rates trend higher as well, roughly double the background rate, though individual studies vary in how strong the signal is.¹³

What Pre-Pregnancy Screening Looks Like

Turner syndrome on its own is not a reason to say no to pregnancy, but a thorough medical evaluation is required before anyone moves forward. International guidelines recommend that all women with Turner syndrome considering pregnancy receive counseling about the cardiovascular risks, along with detailed imaging of the heart and aorta within two years of a planned pregnancy. That imaging typically includes echocardiography and either a CT scan or cardiac MRI to get precise measurements of the aorta.¹⁴

If the ascending aorta is significantly enlarged relative to body size, pregnancy is discouraged. The specific cutoff used in clinical practice is an ascending aortic size index above 2.5 cm/m², or between 2.0 and 2.5 cm/m² when other risk factors are present, such as a bicuspid aortic valve, aortic coarctation, or hypertension.¹⁴ The screening also includes blood pressure checks, thyroid function tests, liver function tests, and blood sugar assessment.¹⁵ The point of all this is not to gatekeep but to identify who can safely proceed and who faces unacceptable danger.

Women who pass the screening still need close monitoring throughout pregnancy. Echocardiograms are repeated during pregnancy to watch for any changes in aortic diameter, and blood pressure management is critical. A multidisciplinary team involving a cardiologist, maternal-fetal medicine specialist, and endocrinologist is considered the standard of care.

Outcomes for the Baby

Babies born to women with Turner syndrome face some additional risks compared with the general population. A large study found that infants of mothers with Turner syndrome were about 3.6 times more likely to experience neonatal complications, nearly three times more likely to be born preterm, and about 4.5 times more likely to be small for their gestational age.¹⁶ These risks may be related to the smaller uterine size, the higher rate of pregnancy complications like preeclampsia, or the underlying physiology of Turner syndrome itself.

When oocyte donation is used, the baby does not inherit Turner syndrome from the mother, since the egg comes from a donor with typical chromosomes. When conception happens naturally in a woman with mosaic Turner syndrome, the situation is different: there is a chance that chromosomally abnormal eggs could lead to a baby with sex chromosome anomalies. This is why preimplantation genetic testing or prenatal diagnosis is recommended for pregnancies conceived naturally or through IVF with the patient’s own eggs.¹⁷ A documented case of a woman with mosaic Turner syndrome who underwent preimplantation genetic testing resulted in the transfer of chromosomally normal embryos and a healthy full-term baby.¹⁸

Fertility Preservation for Younger Patients

Because ovarian function in Turner syndrome declines early and unpredictably, there is growing interest in banking eggs or ovarian tissue while a girl or young woman still has follicles to work with. Egg freezing has been performed in girls with Turner syndrome as young as 13, and ovarian tissue freezing has been attempted in even younger patients. However, the long-term effectiveness of these approaches in this specific population is still unknown.¹⁹

The window for fertility preservation is narrow and hard to predict. A study that performed ovarian biopsies in 57 girls with Turner syndrome found follicles in only about a quarter of them. The karyotype mattered: 86 percent of girls with mosaicism had follicles, compared with about 27 percent of those with structural chromosome abnormalities and only about 11 percent of those with classic 45,X. Girls between 12 and 16 had the highest proportion of detectable follicles, and those who showed signs of spontaneous puberty were far more likely to have them.²⁰ Hormonal markers like FSH and anti-Müllerian hormone levels can help predict who still has ovarian reserve worth preserving, but the conversation needs to happen early because the window closes fast.

Adoption, Surrogacy, and Other Routes to Parenthood

Not every woman with Turner syndrome wants to carry a pregnancy, and not every woman can do so safely. For those with significant aortic enlargement or other cardiovascular contraindications, gestational surrogacy is an option that allows a biological connection through the partner’s sperm and a donor egg, without the risks of pregnancy. Adoption is another well-established path. A survey of individuals with Turner syndrome found that interest in adoption was significantly linked to concerns about pregnancy-related health risks for both themselves and a future child.²¹

These alternatives are not consolation prizes. For women who have been told that pregnancy would be unsafe, surrogacy and adoption can bring the same fulfillment of parenthood without the medical gamble. The decision often comes down to a candid assessment of cardiovascular status combined with personal priorities about biological connection, pregnancy experience, and risk tolerance.

The Emotional Weight of Infertility in Turner Syndrome

Across all age groups, infertility ranks as the most frequently cited concern among women with Turner syndrome, ahead of short stature, sexual development, and general health.²² That finding holds whether a woman is in her teens, twenties, or forties. The weight of the issue shifts over time: younger women may be processing the news for the first time, while older women may be grieving a path they were unable to take or navigating the financial and emotional demands of donor egg cycles.

The medical system tends to focus on the technical steps of achieving pregnancy, but the psychological dimension deserves equal attention. Learning early in life that natural fertility is unlikely can shape self-image, relationships, and life planning in ways that go well beyond the reproductive system. Access to psychological support and peer communities, where women share experiences of donor egg cycles, failed transfers, successful pregnancies, and decisions to pursue adoption, can make the journey less isolating. Healthcare providers who work with Turner syndrome increasingly recognize that fertility counseling should start in adolescence rather than being deferred until a woman is actively trying to conceive.

When IVF Uses the Patient’s Own Eggs

For the subset of women with mosaic Turner syndrome who still produce eggs, IVF with their own oocytes is sometimes possible. The challenge is that a meaningful proportion of those eggs may carry chromosomal abnormalities. A study of 100 IVF cycles in women with mosaic Turner syndrome found enough concern about X chromosome abnormalities in embryos to warrant routine preimplantation genetic testing.¹⁷ By screening embryos before transfer, doctors can select those with a normal chromosome count, reducing the risk of miscarriage or a baby with a chromosomal condition.

This approach bridges the gap between natural conception and full donor-egg IVF. It allows a genetic connection to the child while still offering the safety check of embryo screening. The catch is that it requires adequate ovarian reserve, and many women with Turner syndrome simply do not have enough eggs to make multiple IVF cycles feasible. For those who do, the combination of IVF with genetic testing offers a meaningful option that was not available a generation ago.

1
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PubMed Central. Aortic dissection in Turner syndrome
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PubMed Central. Fertility Preservation in Women with Turner Syndrome: A Comprehensive Review and Practical Guidelines
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