Current evidence indicates that babies born from frozen embryo transfer are as healthy as those born from a fresh transfer, and vitrification has strengthened that safety record. Because this ultra-rapid freezing avoids the ice crystal formation that could once damage cells, embryo survival and integrity after warming are now very high. The HFEA confirms that frozen embryo transfer is a well-established and routine part of IVF in the UK.
There is also a wider safety benefit. Moving to single embryo transfer, which the freeze-all approach supports, sharply reduces twin and triplet pregnancies, and multiple pregnancies carry higher risks for both mothers and babies. So the shift towards freezing and elective single embryo transfer improves safety on two fronts at once. All of this depends on the freezing and storage process being carried out to a high standard, using validated vitrification kits and dependable cryogenic storage.
