The study compares cases between siblings born from the same mother in different pregnancies by egg donation. No differences were found in the transfer of fresh or frozen embryos.
Popularly, there has been a tendency to think that babies born using assisted reproduction techniques are born prematurely and with a lower weight than is expected. However, studies have shown over the years that assisted reproduction treatments have no impact on the health or size of newborns.
The IVI study Difference in birth weight of consecutive sibling singletons is not found in oocyte donation when comparing fresh versus frozen embryo replacements, which was presented at 71st Congress of the American Society for Reproductive Medicine (ASRM), confirms that, when comparing cases of siblings born using egg donation, and leaving aside the independent variables that may affect the pregnancy, there is no difference in the length of gestation and size between the foetuses obtained after fresh or frozen embryo replacement.
“This study is extremely useful for the area of reproductive medicine, as it has enabled us to discover that the origin of the embryos, either fresh or frozen, actually has no bearing on the health, length of pregnancy or birth weight of the babies”, explained Dr. Daniela Galliano main author of the study.
To carry out the study, a sample was taken of a total of 360 women who had become pregnant using egg donation treatment. They had to meet the requirements of having given birth to at least two babies in different pregnancies, of which at least one had to be from a frozen embryo and the other had to have been transferred fresh.
"This way, we saw the impact that freezing embryos has on the prematurity and size of the future newborn and we were then able to establish that there is no difference in these aspects between the transfer of fresh and deferred embryos. Moreover, throughout the study we controlled the phenotypic, clinical and laboratory factors that could have an impact on this relationship, but we did not find any of them to be crucial enough to establish a preference at the time of transfer between fresh or frozen embryos", the doctor concluded.
28 Oct 2015