The Real Risks of Surrogacy Twins (And Why Single Embryo Transfer Protects You)

You’re already doing something extraordinary — offering to carry a child for a family who can’t do it on their own. Your health, your safety, and your ability to go home to your own family after delivery matter enormously. That’s exactly why we need to talk honestly about surrogacy twins, and what a twin pregnancy for surrogates actually looks like medically.

Intended parents sometimes push for two embryos. The logic seems reasonable: one transfer, two babies, a complete family. But the risks of surrogacy twins are well-documented and serious — for you, and for the babies. The medical community’s position on this has been clear for years. Single Embryo Transfer (SET) is the standard of care, not a suggestion.

Why Twin Pregnancies Are No Longer the Goal in IVF

There was a time when transferring multiple embryos was standard practice. Early IVF technology had modest success rates, so clinics transferred two or three embryos at once just to improve the odds of any pregnancy taking hold.

That era is over. Advances in embryo grading, genetic testing (PGT-A), and cryopreservation have made single embryo transfers far more reliable. Today, the ASRM’s official 2021 guidance on embryo transfer limits explicitly recommends Single Embryo Transfer for gestational carriers — and notes that when financial barriers are removed, patients almost universally prefer the path to a healthy singleton pregnancy.

The data backs this up. A study published in The New England Journal of Medicine found that single embryo transfer followed by a frozen transfer produced comparable live birth rates to dual embryo transfer — with dramatically fewer twin pregnancies and the complications that come with them.

What the Risks of Surrogacy Twins Actually Look Like for You

This section is about your body. A healthy, qualified surrogate still faces elevated medical risks in a twin pregnancy — because the demands on your cardiovascular system, uterus, and metabolic health are fundamentally different when carrying two babies.

Preeclampsia: The Cardiovascular Risk

Preeclampsia — a dangerous blood pressure condition — affects approximately 1 in 5 women carrying twins, according to a large cohort study published in the American Journal of Obstetrics and Gynecology. That’s nearly 19% of all twin pregnancies.

Add gestational diabetes to the picture, and that rate climbs to 31%. Left uncontrolled, preeclampsia can cause seizures, organ damage, or the need for emergency early delivery. It can also affect your ability to carry future pregnancies.

Gestational Diabetes: Double the Metabolic Load

Twin pregnancies carry a 2-to-3 times higher gestational diabetes risk than singleton pregnancies, according to research published in Epidemiology. Two placentas produce far more hormones that interfere with insulin function. This means stricter dietary monitoring, more frequent blood draws, and in many cases, insulin management throughout the pregnancy.

That’s months of additional medical management — and more appointments, more check-ins, more stress on your daily schedule and your family’s.

C-Section Risk and Recovery

Most twin deliveries end in cesarean section. One 2023 study published in the Journal of Clinical Medicine found that over 82% of twin pregnancies with gestational diabetes required C-section — compared to under 40% of singleton GDM pregnancies. Even without GDM, twin delivery via C-section is far more common than for singletons.

A C-section is major abdominal surgery. Recovery is longer, more painful, and more limiting. That matters when you have your own children waiting for you at home.

Postpartum Hemorrhage

When the uterus has been significantly more stretched to accommodate two babies, it has a harder time contracting after delivery. This increases the risk of postpartum hemorrhage — severe bleeding that can require blood transfusion and, in serious cases, emergency surgical intervention.

What Surrogacy Twins Mean for the Babies

Your health is the priority. And what’s safest for you is also safest for the babies.

Premature Birth: The Biggest Risk

This is the number that matters most. According to CDC data, 65% of twins are born prematurely — before 37 weeks — compared to just 14% of singletons. Twins also arrive an average of three weeks earlier than singletons: around 36 weeks rather than 39.

Those three weeks aren’t a minor gap. Weeks 36 through 39 are when the brain completes key development. Babies born before 37 weeks face higher rates of respiratory distress syndrome, feeding difficulties, and brain bleeds. Many spend weeks or months in the NICU.

Low Birth Weight and Long-Term Consequences

57% of twins are born with low birth weight (under 2,500g), compared to 9% of singletons. Low birth weight is directly linked to higher rates of developmental delays, learning disabilities, and neurological problems that can persist for years.

For intended parents, the emotional and financial cost of ongoing medical care for children born with health challenges can far exceed what they imagined when they requested two embryos.

Twin-to-Twin Transfusion Syndrome (TTTS) and IUGR

Identical twins sharing a placenta face an additional risk: Twin-to-Twin Transfusion Syndrome (TTTS). One twin receives too much blood while the other receives too little. Left untreated, TTTS can be fatal for one or both babies.

Intrauterine Growth Restriction (IUGR) — where one or both babies fail to grow at a normal rate — also occurs more frequently in multiple pregnancies. Both conditions require intense monitoring and specialized intervention.

The “Two-for-One” Cost Myth — What the Numbers Actually Show

Some intended parents frame a twin pregnancy as a cost savings. One transfer. Two babies. Done.

The math doesn’t hold up.

According to the Health Care Cost Institute’s 2023 analysis, the average NICU admission costs $71,158 — and that’s per baby. Level III NICU care for a premature newborn runs $5,000 to $10,000 per day. Severe cases can exceed $1 million in total hospitalization costs.

For a twin pair born at 32 weeks, both requiring NICU care for several weeks, total hospital costs can easily reach $200,000 or more — on top of everything else the intended parents have already spent on their surrogacy journey. That’s not a savings. That’s a financial emergency.

There’s also the timeline. International intended parents who need to remain in the U.S. while premature twins grow strong enough to travel face weeks of additional hotel, food, and living costs — on top of lost income. The real total picture is far from two-for-one.

How the Decision on Embryo Transfer Is Made

This isn’t a surrogate’s call alone — and it’s not solely the intended parents’ call either. The fertility doctor (Reproductive Endocrinologist, or REI) makes the final clinical determination based on safety. They have an ethical obligation to act in the best interest of everyone involved.

When evaluating embryo transfer decisions, REI physicians consider:

• Embryo quality. Has the embryo undergone preimplantation genetic testing (PGT-A)? A high-quality, chromosomally normal embryo has strong odds of implanting without needing a second embryo alongside it.
• Egg provider’s age. Younger eggs generally produce higher-quality embryos. With younger donor eggs or a younger IP, one embryo often produces excellent outcomes.
• Surrogate history. A surrogate with a healthy, uncomplicated prior pregnancy typically has a well-prepared uterus. That already supports successful implantation.
• Transfer history. First transfers with good-quality blastocysts in younger patients have strong success rates with SET.

Reputable fertility clinics follow ASRM guidance closely. At Physician’s Surrogacy, our physician-led team works in collaboration with partner fertility centers, and the medical conversation around transfer decisions is always grounded in safety — not convenience.

Why Committing to SET Can Actually Help You Match Faster

Here’s something most surrogates don’t expect: being clear about Single Embryo Transfer can work in your favor during matching.

Well-informed intended parents — the kind who have done their research — understand the risks of surrogacy twins. They’re not looking for a surrogate who will agree to anything. They want someone medically informed, safety-conscious, and aligned with best practices.

When you communicate clearly that you prioritize SET, you signal exactly that. You’re not being difficult. You’re being the kind of surrogate a thoughtful, educated family wants to partner with.

At Physician’s Surrogacy, we match intended parents with pre-screened gestational surrogates in an average of one week — from the largest physician-screened surrogate pool in the country. Our screening process is designed by in-house OB/GYNs, and the physician-led oversight means medical conversations around embryo transfer happen within a clinical framework built around your safety.

Surrogacy Is One of the Most Generous Acts a Person Can Make

Gestational surrogacy is one of the most medically sophisticated ways a family can be built — and one of the most human. The fact that you’re considering this journey speaks to something profound.

But generosity doesn’t mean accepting unnecessary risk. The risks of surrogacy twins are real, well-documented, and worth taking seriously — not because the outcome will always be catastrophic, but because your health and your ability to return to your own family matter. SET exists precisely to protect that.

If you want to learn more about what the surrogacy journey looks like at Physician’s Surrogacy — including what surrogates earn and how our physician-led model monitors your pregnancy from transfer to delivery — our team is ready to answer your questions.

See if you qualify and take the first step toward a journey built on safety, transparency, and medical expertise you can trust.

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Julianna Nikolic

Chief Strategy Officer Julianna Nikolic leads strategic initiatives, focusing on growth, innovation, and patient-centered solutions in the reproductive sciences sector. With 26+ years of management experience and a strong entrepreneurial background, she brings deep expertise to advancing reproductive healthcare.