Twins, Twiblings and Sibling Journeys: What "Two Babies" Actually Costs

Almost nobody comes to me asking about twins because they've always dreamed of having twins.

They come because they are exhausted. Because they've already spent years, and often a great deal of money, trying to build their family. Some have been through multiple unsuccessful IVF cycles. Others, including many gay male couples, know that surrogacy is likely to be the only route to parenthood and want to complete their family in a single journey if possible. Some are in their mid-forties and feel that the arithmetic of doing this twice, sequentially, is simply overwhelming. Some have been presented with programmes abroad that promote twin pregnancies as a more efficient or cost-effective way of completing their family.

I want to acknowledge that before I say anything else. The motivation behind almost every twin request I receive is not greed or convenience. It is exhaustion, financial reality, and a very understandable desire to avoid repeating an emotionally, physically, and financially demanding process.

But what I've learned over the years is this: the option that looks least expensive on a quotation is often the one that transfers the greatest amount of risk onto your surrogate, your future children, and ultimately onto you. The differences between the four possible routes to having two children are not simply matters of personal preference. They are fundamentally about who bears the medical, legal, financial, and emotional consequences when things do not go according to plan.

So let's look at each of the four options properly.

First, let's fix the vocabulary

The word "twiblings" gets used to describe two completely different things, and the confusion matters more than it sounds.

It was coined by the writer Melanie Thernstrom in a New York Times Magazine piece published in January 2011. After six failed rounds of IVF, she and her husband used one egg donor and two gestational carriers. The two babies were born five days apart. What almost everyone forgets about that story is why she did it: she had spoken to a high-risk pregnancy specialist who asked her whether her goal was to experience pregnancy or to have the best chance of a healthy baby. She chose two carriers specifically to avoid a twin pregnancy.

By 2013, the same word was being used for something close to the opposite. The BBC reported on a British couple expecting four babies - two sets of twins, carried simultaneously by two surrogates in India. The lawyer Natalie Gamble, interviewed for the piece, explained that transferring embryos into several surrogates at once was an option routinely presented to intended parents going to India, with the aim of maximising the chance that something would work.

Same word. One version is a deliberate strategy to reduce risk. The other is a hedge against failure that multiplies it. When an agency uses the term with you, find out which one they mean.

Here are the four routes, and I'd ask you to keep them separate in your mind for the rest of this article:

1. Double embryo transfer (DET): two embryos, one surrogate, one pregnancy. This is the only route that produces actual twins.

2. Concurrent journeys: two surrogates, transfers timed close together, two pregnancies running in parallel. True twiblings.

3. A staggered sibling journey: one journey completed or well established, then a second one begun.

4. Sibling embryos in storage: no second journey planned yet, but embryos kept for later.

They have four different price tags, four different risk profiles, and four different failure modes.

Route one: two embryos, one surrogate

This is the cheapest-looking option and the one I most often advise against.

The medical position is not ambiguous, and it is written specifically for situations like yours. ESHRE's guideline on the number of embryos to transfer, published in Human Reproduction in April 2024, concluded that no clinical or embryological factor on its own justifies choosing double embryo transfer over elective single embryo transfer. The full guideline document puts the surrogacy case in a single sentence: only elective single embryo transfer should be practised for gestational carriers.

ASRM says the same. Its 2023 Ethics Committee opinion on gestational carriers states that single embryo transfer is the preferred approach for gestational carrier cycles, and that adherence to that guidance matters particularly in these arrangements.

Let me give the other side its best argument first

Because there is one, and you deserve to hear it stated properly rather than waved away.

Transferring two embryos does raise the live birth rate per transfer. A study of 583 frozen blastocyst transfers to gestational carriers, published in Fertility and Sterility, found the live birth rate was significantly higher with two embryos than with one. 

If you are paying per attempt, that is a real and rational consideration, and anyone who tells you otherwise is not being straight with you.

The answer to it is cumulative outcome. ESHRE's position, summarised by its own scientific news service, is that the cumulative live birth rate from sequential single transfers is not inferior to double transfer - you get to the same place, one embryo at a time, without the multiple pregnancy. What double transfer buys you is speed. What it costs is everything below.

What the surrogacy-specific data actually shows

Most articles on this topic quote general twin statistics. The gestational carrier data is more relevant to you, and it is stark.

In that same Fertility and Sterility analysis of transfers to gestational carriers, comparing single with double embryo transfer:

• Multiple births: 1.9% after single transfer, 20.0% after double

• Preterm birth: 13.4% after single transfer, 40% after double

• Low birthweight: 3.8% after single transfer, 12.5% after double

• Very low birthweight: 0.6% after single transfer, 5% after double

A separate analysis of nearly 4,800 donor-oocyte gestational carrier cycles in the SART database found multiple pregnancy rates of 42–45% where more than one blastocyst was transferred, against 1.4–3.3% after single transfer. Its authors noted plainly that many US clinics were not adhering to ASRM transfer guidelines, which is worth remembering before assuming a clinic's willingness to do this reflects considered medical judgement.

The broader risk picture is summarised in an editorial in Acta Obstetricia et Gynecologica Scandinavica, which draws on a systematic review of 60 studies comparing twins with singletons. Mothers of twins faced higher rates of antenatal hospitalisation, caesarean section, gestational diabetes, preterm labour, pregnancy-induced hypertension, pre-eclampsia, placental abruption, placenta previa and postpartum haemorrhage. For the babies, rates were higher for congenital anomalies, preterm birth, low birthweight, NICU admission, perinatal mortality and stillbirth. 

On prematurity specifically, ISUOG's updated practice guidelines on twin pregnancy report that roughly 60% of twins are born before 37 weeks and 12% before 32 weeks, around 5.4 and 7.6 times the equivalent singleton rates. In fairness, that headline figure overstates your specific risk: for dichorionic diamniotic twins, which is what two transferred embryos produce, the rate is about 48.6%. Still roughly half.

And the direction of travel in the profession is unambiguous. A study of all 40,177 US gestational carrier transfer cycles from 2014 to 2020 found multiple embryo transfers fell by 79.2%, with multiple gestations dropping by 68.8% in donor cycles and 73.6% in autologous cycles, as PGT-A use rose. The field has spent a decade moving away from this. Programmes still selling it as a feature are selling you something the evidence base abandoned.

The part that changes the maths entirely

Here is what I most want you to take from this article, and it is a point about money rather than medicine.

Specialist newborn insurance for surrogacy may be difficult or impossible to obtain for twin pregnancies resulting from a multiple-embryo transfer. Where cover is available, it is often subject to significant exclusions, limitations, or other conditions that should be reviewed carefully before proceeding. Insurance products, eligibility criteria, and policy terms vary between providers and can change over time, so it is essential to confirm your own position directly with an experienced insurance broker before making a decision. The important point is not to assume that insurance available for singleton pregnancies, or for naturally occurring twins following a single embryo transfer, will necessarily extend to an elective twin pregnancy following the transfer of multiple embryos.

Think about what that means. The route chosen to save money can be the route that leaves your newborns uninsurable, in exactly the scenario with the highest probability of a very large neonatal bill.

And those bills are real. Many international programmes exclude NICU stays, emergency caesareans and preterm birth costs from the package price. Published estimates for NICU care abroad vary widely by country and hospital. Sensible Surrogacy puts overseas NICU care at roughly $500–$1,000 a day in international destinations, while other agency estimates run to $1,000–$5,000 a day, with a three-week stay generating a bill of $50,000–$100,000. Physician's Surrogacy estimates $10,000–$30,000 out of pocket in the US. These are commercial sources rather than published research, and the spread between them tells you how little standardised data exists, but every one of them agrees the bill lands on you, and typically before you can take your babies home. In the United States, each baby is treated as a separate patient, meaning two policies, two deductibles and two out-of-pocket maximums.

Meanwhile, the visible cost of choosing double transfer is small. As of mid-2026, the additional compensation to a surrogate for a multiple pregnancy typically runs $5,000–$10,000, and in Georgia a carrier expecting twins may receive around $10,000 extra, with roughly $3,000 more for a caesarean. I've written more about how these payments are structured in my guide to surrogate mother fees.

So the trade is this. You may save perhaps $50,000 on a second journey. You pay around $10,000 more to your surrogate. You raise her chance of a preterm delivery from roughly one in seven to roughly two in five. And you may forfeit the insurance that would have covered the consequences.

I don't think that's a bargain. I think it's a risk transfer that isn't priced, and the person absorbing most of it didn't choose it.

Route two: two surrogates at the same time

This is the genuine twibling route, and I want to give it a fair hearing, because there are real arguments for it.

ASRM's 2023 Ethics Committee opinion on gestational carriers addresses simultaneous arrangements directly, and does so in a balanced way. In favour: the reproductive autonomy of everyone involved; the plain fact that two singleton pregnancies carry less risk to carriers and babies than one twin pregnancy; and a shorter path to completing a family, which the Committee notes may matter particularly for older intended parents.

What it costs

Concurrent journeys abroad are priced roughly as two programmes, with modest savings where a single egg retrieval serves both.

As of mid-2026, published package pricing puts Colombian sibling packages using two surrogates at roughly $110,000–$130,000, against about $50,000–$77,000 for a single programme. In Cyprus, twin packages using two carriers start around €122,000. These are agency and comparison-site figures rather than audited data, so treat them as a starting point for negotiation, not a quotation. A useful reference point: two separate overseas journeys cost roughly what one surrogacy journey costs in the United States.

There is also a timing reality that gets glossed over. Two surrogates are not guaranteed to deliver at the same time. Thernstrom's babies arrived five days apart, which is close to the best case. Weeks or even months apart is entirely possible, and that has consequences I'll come to below.

Route three: the staggered sibling journey

This is the route most families should be looking at first, and it's the one with the least written about it.

Medical guidance generally recommends a minimum of 12–18 months between pregnancies to allow a surrogate's body to recover fully, and most clinics require at least 6–12 months postpartum before a further embryo transfer, with some preferring longer. If you hope to work with the same woman again, raise it early and gently — and accept that the honest answer may be no.

The advantages are real and underrated. You give your first surrogate your full attention. You learn how your clinic actually performs before you commit further money. You discover whether your embryos work in practice rather than on paper. And you handle one newborn at a time, which after several years of infertility is not a small consideration.

But there is a specific risk to staggering an international journey that I want you to plan for, because it has just become considerably less theoretical.

Your embryos live in a jurisdiction, and jurisdictions close

A sibling journey a few years ahead is a bet that your destination will still accept you in two or three years' time.

That bet is losing more often than it used to. Kazakhstan banned foreigners from accessing surrogacy in mid-July 2026. Greece introduced a residency requirement in May 2025 that closed it to international parents. Thailand, India, Nepal, Cambodia and Kenya have all restricted or closed access to foreigners over the past decade, and Argentina has cracked down on agency operations. NGA Law describes the underlying pattern: a destination becomes popular, then a sudden crackdown makes it illegal, and the families caught mid-process are left in an impossible position.

When a country closes, the usual pattern is that existing pregnancies are permitted to continue while new embryo transfers stop. Which means if your remaining embryos are sitting in a laboratory in that country, your second child's journey now depends on whether those embryos can be legally exported, to where, and at what cost - questions nobody answers at the point when you're paying for storage.

So when you are planning a sibling journey, three questions belong in your first conversation, not your last:

• Where will my embryos physically be stored, and under whose name and legal control?

• If this country closes to foreign intended parents, can my embryos be exported?

I should be transparent here: I work in this area directly, as Head of Partnerships at an IVF clinic in Tirana, where my involvement is focused on the embryo creation stage. Over the last few years, I have seen many intended parents continue their surrogacy journeys across different countries, with embryos created in Tirana and treatment or pregnancy management taking place elsewhere.

The transportation of embryos between countries has become a well-established and technically straightforward process. However, it is important to understand that each country has its own requirements for the import and acceptance of reproductive material. These may include specific medical tests that must be completed before embryo creation, as well as different legal frameworks regarding donor anonymity and disclosure of donor information.

For anyone considering an international hybrid journey, understanding these requirements at the beginning of the process is essential, as decisions made during embryo creation may affect the options available later in the journey.

Route four: embryos in storage, no plan yet

Many families finish their first journey with embryos remaining and no decision made. That's a perfectly reasonable position, but it isn't a neutral one.

Storage costs accumulate. Consents expire. Clinics change ownership, merge and occasionally close. Laws change around you. And the questions above apply just as much to embryos you haven't decided about as to embryos you're actively planning to use.

This is not hypothetical. After the 2023 investigation into a fertility clinic in Crete, embryos belonging to international intended parents were moved to a general hospital for storage, and when that facility later stopped offering cryopreservation, affected families were given roughly 20 days to collect them. Twenty days, from another country, to arrange the transport of the only embryos you have. Nobody in that group had chosen a risky clinic; they had chosen what was then one of Europe's most respected destinations.

If you're in this position, the useful move is not to decide about a second child. It's to make sure that the option stays genuinely open: confirm in writing where the embryos are, that you are recorded as the legal owners, what the storage term is, when consents lapse, and what the export pathway looks like. Embryo ownership is normally defined by the clinic's consent forms rather than by any agency, which is precisely why your relationship with the clinic needs to be direct. That's an afternoon of admin that protects a decision you may want to make in five years.

The four things that only apply when you do this abroad

Double embryo transfer is still actively sold in many overseas surrogacy destinations.

ASRM and ESHRE recommend against it; a number of international programmes still market twin outcomes as a feature. It has been observed that some clinics, seeking to maximise success rates and profit, use aggressive hormonal protocols on donors and transfer multiple embryos into surrogates. Whether a clinic will do a DET simply because you ask is a very good proxy for whether it follows international guidance at all - a theme I develop further in my guide to vetting fertility clinics in Europe.

Two surrogates means two of everything legal. Two contracts, two birth registrations, two sets of exit documents, two consular appointments. Since the births are not guaranteed to coincide, this can mean two trips, or one very extended stay abroad with a newborn while you wait for the second.

Home-country processes may not align across two births. In the UK, for example, a parental order is required for each child, and the application must be made when the child is between six weeks and six months old, with the surrogate's consent invalid if given within the first six weeks. If your two babies arrive several weeks apart, those windows don't line up neatly, and you'll be running two overlapping legal processes rather than one. The recognition traps that apply to a single birth apply twice over, I've covered those in detail in common mistakes in international surrogacy.

Complication coverage is usually excluded. Read what your package actually covers for NICU, emergency caesarean and preterm birth. Many international programmes exclude NICU stays, emergency caesareans and preterm birth costs entirely.

If you are two fathers, read this part twice

The most common version of this question I receive is from male couples who want one child genetically connected to each of them, and who are told they can achieve it by transferring both embryos to a single surrogate.

Please don't.

If two embryos from two fathers are transferred together and only one implants, you may not know which. If that one embryo splits in vitro, you can end up with two babies related to one parent and none related to the other, the precise opposite of the outcome you were trying to achieve.

If your goal is one child genetically connected to each parent, two separate journeys — concurrent or staggered — is the route that actually delivers it. It costs more because it is more. Anything cheaper is selling you a probability, not an outcome.

How I'd actually decide

If you want two children and you're weighing these routes, work through it in this order.

Start with the medical question, not the price. Is there any clinical reason a twin pregnancy is appropriate here? Almost always the answer is no. That closes route one for most families before cost enters the conversation.

Then ask what you're actually optimising for. Speed, cost, certainty of genetic outcome, or the wellbeing of the children and women involved. You cannot maximise all of these. Being honest with yourself about which one is driving you will point at the right route faster than any spreadsheet.

Then price the whole thing, including the parts nobody quotes. Complication cover. Extended stays. Two sets of legal and consular processes. What happens if only one pregnancy succeeds. What happens if both do.

Then plan for the law changing. Where are your embryos, and what happens to them if this destination closes?

The bottom line

There is no route to two children that is quick, cheap, safe and certain. Every programme promising you all four is holding something back.

What there is, is a set of honest trade-offs. Two staggered journeys are slower, but safer. Two concurrent journeys is faster and costs roughly double. One surrogate carrying two embryos is the cheapest on paper and the only one where the risk lands on someone who didn't choose it and on newborns who may be uninsurable.

You are not being greedy for wanting two children. After what most of you have already been through, wanting to be finished is one of the most understandable feelings there is.

Just don't let exhaustion make this decision. That's the one thing the packages are priced to exploit.

If you're weighing a twin package, a concurrent journey or a second journey and want an honest read on what it will really cost and what your destination will actually allow, that's what an independent consultation is for. I don't run surrogacy programmes and I'm not selling you a package. Book a free 30-minute Discovery Session or take the destination questionnaire for personalised guidance.

The Surrogacy Insider is not a surrogacy agency and does not provide surrogate matching services. This article is for general information and does not constitute legal or medical advice. Costs and laws change frequently; always confirm the current position with qualified independent legal and medical professionals before making decisions.