IVF success without twins? A new study suggests it's possible
An Australian study has found that modern IVF can sharply lower twin and triplet pregnancies without reducing birth success. The findings highlight how single embryo transfer, backed by newer lab techniques, is making treatment safer.
For many couples struggling with infertility, IVF (In Vitro Fertilisation) offers hope of becoming parents. However, one of the well-known concerns with IVF has been the higher chance of twin or triplet pregnancies. While some couples may see twins as a blessing, doctors say multiple pregnancies carry greater health risks for both the mother and the babies.
Now, a large Australian study has found that modern IVF techniques can greatly reduce the chances of twin and triplet pregnancies without reducing the overall success rate of treatment. Researchers say advances such as blastocyst culture, vitrification, and single embryo transfer are helping more women achieve healthy pregnancies while avoiding complications linked to carrying multiple babies.
The findings come from an analysis of 18,396 women who underwent their first IVF treatment at seven fertility clinics in Australia between 2012 and 2021. The study shows that IVF has evolved significantly over the past decade, making treatment safer while maintaining excellent pregnancy outcomes.
WHAT DID THE STUDY FIND?
Researchers analysed the outcomes of women undergoing IVF for the first time over nine years.
The study found that:
- Nearly 68% of women had a successful birth within three IVF cycles.
- Only 2.9% of pregnancies resulted in twins or triplets, a major reduction compared to earlier years.
- Around 95% of IVF treatments involved transferring just one embryo, yet pregnancy success remained high.
According to the researchers, these findings show that transferring a single carefully selected embryo can provide excellent pregnancy rates while avoiding the health risks associated with multiple pregnancies.
WHY WERE TWINS MORE COMMON IN IVF BEFORE?
In the early years of IVF, pregnancy success rates were lower than they are today.
To improve the chances of implantation, doctors often transferred two or even three embryos into the uterus during one IVF cycle. While this increased the likelihood of pregnancy, it also raised the chances of twins or triplets.
Although many people consider twins exciting, doctors point out that multiple pregnancies are medically high-risk. Women carrying twins are more likely to experience:
- Premature delivery
- High blood pressure during pregnancy
- Gestational diabetes
- Caesarean delivery
- Pregnancy complications
Babies born from twin pregnancies are also more likely to have low birth weight, require neonatal intensive care, or face developmental challenges because they are born early.
WHAT IS BLASTOCYST CULTURE?
One of the major advances highlighted in the study is blastocyst culture.
Instead of transferring the embryo after only two or three days of development, doctors allow it to grow in the laboratory for five to six days until it reaches the blastocyst stage.
At this stage, specialists can better identify embryos that have the highest chance of successful implantation.
Because doctors have greater confidence in selecting a healthy embryo, they often need to transfer only one embryo instead of two.
WHAT IS VITRIFICATION?
The second important technique is vitrification, a modern embryo-freezing method.
Unlike older freezing methods that could damage embryos through ice crystal formation, vitrification freezes embryos extremely quickly, helping preserve their quality.
This allows doctors to safely store extra healthy embryos for future IVF cycles without reducing their chances of survival after thawing.
As a result, patients do not need to transfer multiple embryos in a single attempt simply to improve their chances of pregnancy.
WHY IS SINGLE EMBRYO TRANSFER BECOMING MORE POPULAR?
The combination of blastocyst culture and vitrification has made single embryo transfer the preferred option in many fertility centres around the world.
Rather than placing two embryos inside the uterus, doctors carefully choose the healthiest embryo and preserve the remaining embryos for later use if needed.
This approach aims to achieve one healthy pregnancy at a time while reducing avoidable risks associated with twins and triplets.
WHAT DOES THIS MEAN FOR COUPLES?
The study suggests that couples no longer need to assume that transferring two embryos gives them a better chance of having a baby.
Modern laboratory techniques allow fertility specialists to achieve high pregnancy success even when only one embryo is transferred.
If the first attempt is unsuccessful, frozen embryos can be used in future treatment cycles without repeating the entire IVF process.
According to Dr Sneha Mishra, Consultant, IVF and Infertility Department, Yashoda Medicity Hospital, Ghaziabad, the techniques discussed in the study are not new and are already available in India.
She explains that blastocyst culture and vitrification help reduce the chances of twin pregnancies by supporting single embryo transfer. However, treatment decisions are often influenced by the couple's preferences. Some couples undergoing IVF may request the transfer of more than one embryo because they hope to have two children through a single pregnancy. In contrast, couples who specifically want one baby are more likely to benefit from these techniques.
Dr Mishra says that when medically appropriate, transferring a single healthy embryo is a safer approach that reduces the likelihood of twins while still offering a good chance of pregnancy.
The latest Australian research reflects how IVF has become safer and more precise over the years. With techniques such as blastocyst culture, vitrification, and single embryo transfer, fertility specialists can now achieve strong pregnancy success rates while significantly reducing the chances of twins and triplets.
For couples considering IVF, experts say the best treatment plan should always be based on medical advice, age, fertility history, and individual goals rather than the belief that transferring more embryos automatically leads to better outcomes.
For many couples struggling with infertility, IVF (In Vitro Fertilisation) offers hope of becoming parents. However, one of the well-known concerns with IVF has been the higher chance of twin or triplet pregnancies. While some couples may see twins as a blessing, doctors say multiple pregnancies carry greater health risks for both the mother and the babies.
Now, a large Australian study has found that modern IVF techniques can greatly reduce the chances of twin and triplet pregnancies without reducing the overall success rate of treatment. Researchers say advances such as blastocyst culture, vitrification, and single embryo transfer are helping more women achieve healthy pregnancies while avoiding complications linked to carrying multiple babies.
The findings come from an analysis of 18,396 women who underwent their first IVF treatment at seven fertility clinics in Australia between 2012 and 2021. The study shows that IVF has evolved significantly over the past decade, making treatment safer while maintaining excellent pregnancy outcomes.
WHAT DID THE STUDY FIND?
Researchers analysed the outcomes of women undergoing IVF for the first time over nine years.
The study found that:
- Nearly 68% of women had a successful birth within three IVF cycles.
- Only 2.9% of pregnancies resulted in twins or triplets, a major reduction compared to earlier years.
- Around 95% of IVF treatments involved transferring just one embryo, yet pregnancy success remained high.
According to the researchers, these findings show that transferring a single carefully selected embryo can provide excellent pregnancy rates while avoiding the health risks associated with multiple pregnancies.
WHY WERE TWINS MORE COMMON IN IVF BEFORE?
In the early years of IVF, pregnancy success rates were lower than they are today.
To improve the chances of implantation, doctors often transferred two or even three embryos into the uterus during one IVF cycle. While this increased the likelihood of pregnancy, it also raised the chances of twins or triplets.
Although many people consider twins exciting, doctors point out that multiple pregnancies are medically high-risk. Women carrying twins are more likely to experience:
- Premature delivery
- High blood pressure during pregnancy
- Gestational diabetes
- Caesarean delivery
- Pregnancy complications
Babies born from twin pregnancies are also more likely to have low birth weight, require neonatal intensive care, or face developmental challenges because they are born early.
WHAT IS BLASTOCYST CULTURE?
One of the major advances highlighted in the study is blastocyst culture.
Instead of transferring the embryo after only two or three days of development, doctors allow it to grow in the laboratory for five to six days until it reaches the blastocyst stage.
At this stage, specialists can better identify embryos that have the highest chance of successful implantation.
Because doctors have greater confidence in selecting a healthy embryo, they often need to transfer only one embryo instead of two.
WHAT IS VITRIFICATION?
The second important technique is vitrification, a modern embryo-freezing method.
Unlike older freezing methods that could damage embryos through ice crystal formation, vitrification freezes embryos extremely quickly, helping preserve their quality.
This allows doctors to safely store extra healthy embryos for future IVF cycles without reducing their chances of survival after thawing.
As a result, patients do not need to transfer multiple embryos in a single attempt simply to improve their chances of pregnancy.
WHY IS SINGLE EMBRYO TRANSFER BECOMING MORE POPULAR?
The combination of blastocyst culture and vitrification has made single embryo transfer the preferred option in many fertility centres around the world.
Rather than placing two embryos inside the uterus, doctors carefully choose the healthiest embryo and preserve the remaining embryos for later use if needed.
This approach aims to achieve one healthy pregnancy at a time while reducing avoidable risks associated with twins and triplets.
WHAT DOES THIS MEAN FOR COUPLES?
The study suggests that couples no longer need to assume that transferring two embryos gives them a better chance of having a baby.
Modern laboratory techniques allow fertility specialists to achieve high pregnancy success even when only one embryo is transferred.
If the first attempt is unsuccessful, frozen embryos can be used in future treatment cycles without repeating the entire IVF process.
According to Dr Sneha Mishra, Consultant, IVF and Infertility Department, Yashoda Medicity Hospital, Ghaziabad, the techniques discussed in the study are not new and are already available in India.
She explains that blastocyst culture and vitrification help reduce the chances of twin pregnancies by supporting single embryo transfer. However, treatment decisions are often influenced by the couple's preferences. Some couples undergoing IVF may request the transfer of more than one embryo because they hope to have two children through a single pregnancy. In contrast, couples who specifically want one baby are more likely to benefit from these techniques.
Dr Mishra says that when medically appropriate, transferring a single healthy embryo is a safer approach that reduces the likelihood of twins while still offering a good chance of pregnancy.
The latest Australian research reflects how IVF has become safer and more precise over the years. With techniques such as blastocyst culture, vitrification, and single embryo transfer, fertility specialists can now achieve strong pregnancy success rates while significantly reducing the chances of twins and triplets.
For couples considering IVF, experts say the best treatment plan should always be based on medical advice, age, fertility history, and individual goals rather than the belief that transferring more embryos automatically leads to better outcomes.
