Can You Have Twins With IVF? Risks and Safer Transfer Plans
Key Takeaways
Can you have twins with IVF? Yes — most often if more than one embryo implants, and rarely if one embryo splits. Twin pregnancy raises preterm-birth and maternal complication risk compared with a singleton. When another embryo is available, the safer comparison is usually two sequential single transfers, not transferring both at once to avoid a second trip.
Key evidence: ESHRE 2024 guideline on the number of embryos to transfer ASRM 2021 limits on the number of embryos to transfer ASRM 2022 committee opinion on multiple gestation
How twins happen after IVF
Yes. Twins after IVF are real, and they are not simply “double success.”
Most IVF twin pregnancies follow transfer of more than one embryo. A smaller share happens when a single embryo splits and becomes monozygotic twins.
That distinction matters. Transferring two embryos mainly raises the chance of dizygotic twins. Splitting after a single-embryo transfer is uncommon, but it is the residual twin risk that remains even when only one embryo is placed.
Family history of spontaneous twins does not cancel this discussion. In IVF, the dominant controllable factor is how many embryos are transferred.
Why twin pregnancy is not simply double success
Compared with a singleton, twins are much more likely to deliver early and to need extra obstetric and neonatal care. That is true even when the IVF cycle itself went smoothly.
ASRM’s 2022 compilation of published estimates puts delivery before 37 weeks at about 10% for singletons and about 50% for twins. Birth weight under 2,500 g is listed at about 6% versus 53%. Pre-eclampsia appears at about 6% versus 10–12%. These figures are compiled population estimates, not a personal prognosis.
Preterm birth is the main neonatal problem. It can affect breathing, feeding, temperature control and later development, and it is why neonatal intensive care is so much more common with twins.
Chorionicity changes the obstetric picture further. When one embryo splits, the twins are more often monochorionic — they may share a placenta. ASRM describes how shared placental vessels can drive twin-to-twin transfusion, a risk that dichorionic twins from two embryos usually do not carry. Two embryos are not “safer twins.” They are a different, still higher-risk pregnancy than one.
Maternal strain is also greater: more hypertensive disease, more gestational diabetes, more bleeding and delivery complications, and a harder recovery. None of that is rare enough to treat as a footnote.
Why one embryo is usually transferred
Single-embryo transfer is a safety strategy, not a cosmetic change in IVF.
The useful comparison is not “pregnancy this week versus no pregnancy this week.” When another embryo can be frozen, a later frozen transfer can still be used. The aim is a healthy singleton, built if needed across more than one transfer.
| One embryo now | Two embryos now | |
|---|---|---|
| Chance of pregnancy from this transfer | May be a little lower | May be a little higher |
| Twin pregnancy | Uncommon; mainly if the embryo splits | Substantially higher |
| Cumulative chance of a healthy singleton | Often similar when another embryo is available | Not clearly better |
| Travel | A second trip may be needed | One trip, with a higher obstetric burden |
Those rows are a counselling frame, not a personal percentage. Live-birth chance still depends on age, embryo quality, the uterus and how many embryos remain.
IVF itself has other medical risks. Multiple pregnancy is the one most directly changed by the number of embryos transferred.
What the guidelines actually say
The 2024 ESHRE guideline recommends elective single-embryo transfer as the standard whenever more than one embryo is available. Its development group concluded that no clinical or embryological factor by itself justifies double-embryo transfer instead. Cumulative live birth has not been shown to be inferior with sequential single transfers, while multiple pregnancy is clearly higher after transferring two.
ASRM 2021 transfer limits point in the same direction, with more room for individualisation. A euploid embryo should be limited to one, regardless of age. Patients under 35 should be strongly encouraged toward a single embryo. In poorer-prognosis settings, ASRM still describes situations in which an extra untested embryo may be considered, with counselling and a record of the reason.
Those two documents do not say exactly the same thing about exceptions. ESHRE is stricter. ASRM leaves more room when prognosis is unfavourable. Neither treats twins as a bonus.
SART data cited in the ASRM documents show how much practice has already moved. The 2021 ASRM transfer limits report that twin gestation among women under 38 with a successful IVF cycle fell from 23% in 2014 to 12.4% in 2017. The 2022 ASRM committee opinion records IVF twin births reported to SART falling from over 30% in 1998 to 9.7% in 2018. The remaining twins are still far from a background rate.
Dr. Aksoy’s Approach
Travel cost and a second trip deserve a hearing. They do not change the biology.
Dr. Aksoy still insists on single-embryo transfer when the embryo is euploid, when the patient is young or otherwise has a good prognosis, and whenever a twin pregnancy would add substantial extra risk. Examples he uses are significant cardiac disease, hypertension, uterine or cervical problems, and a history of very preterm birth or serious pregnancy complications.
Transferring two embryos may slightly increase the chance of pregnancy from that particular transfer. It substantially increases the risk of twins, prematurity, neonatal intensive care and maternal complications. The comparison he uses with travelling patients is not “one trip versus two.” It is the cumulative chance of a healthy singleton from two sequential single transfers versus the risks of putting both embryos in at once.
Planning treatment abroad should organise logistics around that safer sequence. It should not treat an avoidable twin pregnancy as the price of a shorter stay.
FAQ
Can you have twins with IVF if only one embryo is transferred?
Yes, rarely — if that embryo splits. Most IVF twin pregnancies still follow transfer of more than one embryo.
Are twins after IVF automatically a good result?
Not medically. Some twin pregnancies end with healthy babies. The pregnancy still carries higher risks of prematurity, hypertensive disease, gestational diabetes and neonatal intensive care than a singleton.
Why is single-embryo transfer recommended so often now?
Because it reduces avoidable twins. When another embryo can be stored, sequential single transfers have not been shown to lower cumulative live birth in the way patients often fear.
If twins run in my family, does that change IVF transfer planning?
Usually not in a way that removes the IVF risk discussion. Transfer planning is based mainly on embryo number, prognosis and obstetric safety, not on a family history of spontaneous twins.
Does travelling for IVF justify transferring two embryos?
Travel inconvenience is real. It does not change the medical comparison. Two embryos may raise the chance of pregnancy from that visit and still create an avoidable twin risk. A second single-embryo transfer is often the safer way to use the remaining embryo.
Sources
- Alteri A, Arroyo G, Baccino G, et al. ESHRE guideline: number of embryos to transfer during IVF/ICSI. Human Reproduction. 2024;39(4):647–657. PMC10988112.
- Practice Committee of the American Society for Reproductive Medicine and the Practice Committee of the Society for Assisted Reproductive Technology. Guidance on the limits to the number of embryos to transfer: a committee opinion (2021). Fertility and Sterility. 2021;116(3):651–654. ASRM.
- Practice Committee of the American Society for Reproductive Medicine. Multiple gestation associated with infertility therapy: a committee opinion (2022). Fertility and Sterility. 2022;117(3):498–511. ASRM.
The content has been created by Dr. Senai Aksoy and medically approved.