One discussion theme which comes up now and again on fertility websites and forums is whether to put back one embryo or two when you are having IVF, and there are always people advising others to “go for two” because it will double the chances of getting pregnant if you “don’t mind” having twins. For anyone who is struggling to conceive, the idea of twins can seem hugely attractive – an instant family in one go – but it’s important to be clear that multiple pregnancy is the biggest risk from IVF treatment for you and for your baby.
The best advice to anyone who is thinking about this as a dilemma is that you should be guided by the embryologists at your clinic, assuming you are having treatment here in the UK where your health and that of your babies is always put first when it comes to numbers of embryos to transfer. Most women should have one embryo put back, and two are only considered if you have had repeated unsuccessful attempts at IVF in the past, if you are older or if your embryos look less likely to implant. Putting two embryos back will not double your chances of getting pregnant. In fact, when single embryo transfer is based on your embryologist’s advice, it should not reduce your chances of getting pregnant and if you would have got pregnant with twins, you will still get pregnant with one embryo. A multiple pregnancy is more likely to end in miscarriage but this is not always considered when people are making decisions about how many embryos to transfer.
Although we all know lots of twins who are flourishing and healthy, we don’t hear so much about those who aren’t. The increased risk of miscarriage, and of problems for the babies who are more likely to be born prematurely and may have disabilities or long term problems is very real. There are also risks for the mother such as high blood pressure and pre eclampsia and haemorrhage. You can read more about this here on the HFEA website.
This is why the best fertility clinics – those who really have your interests at heart – have a good success rate and a low multiple pregnancy rate.