One of the effects of assisted reproduction techniques is that it increases the chances of giving birth to two or more babies, since the transfer of several embryos is usually done to increase the probability of pregnancy.
Great controversy has arisen about how many ovules should be implanted, especially after cases like the one of the octillizos born this year in the United States. But the truth is that multiple pregnancies are less and less frequent in cases of assisted reproduction.
According to data from 2006 (the last ones collected) of the European Society of Assisted Reproduction and Embryology (Eshre) births by assisted reproduction are twins in less than 20% of cases when in 1997, 9 years ago, they were almost 26%.
The decrease in twin pregnancies due to assisted reproduction is due to the fact that fewer and fewer embryos are transferred to mothers. This happens thanks to the fact that a genetic study of the embryo called preimplantation genetic diagnosis is previously carried out, which allows only the embryos that have greater guarantees to develop inside the maternal uterus to be implanted.
It is clear that assisted reproduction techniques have undergone a breakthrough in recent years.
One of its pending accounts was precisely (and still is) the reduction of multiple unwanted pregnancies due to the complications that can lead to taking into account that women become mothers at increasingly advanced ages, a fact that increases risks in the case of pregnancies of two or more embryos.
