Part of the reason is that twins are far more memorable
than singletons. This is specially true if the birth of the twins has happened
after many years of infertility , because
On the other hand, singleton IVF pregnancies are not very memorable
- and infertile couples will often not even share the information that they did
IVF to get pregnant.
Also, multiple pregnancies after IVF used to be much commoner
in the past , because many IVF clinics would transfer multiple embryos at one
time. They didn't have very good success rates, and in order to increase the chances of success,
they would put many embryos in the hope that at least one would stick ! The problem
was that if multiple stuck, patients would end up with multiple pregnancies.
This is an outdated practice today, because the
complication rate with a twin pregnancy is higher. While many infertile couples
are excited about the possibility of getting twins , because they think of this
as an " instant family in one cycle", and while it's true that a twin
pregnancy is better than not getting pregnant at all, the truth is that this is
not in your baby's best interests.
Global best practices recommend that you should transfer
only a single blastocyst at one time , and freeze the rest. This way , the
cumulative pregnancy rate is higher, and it's much safer for everyone !