Traditional IVF fertilizes up to a dozen eggs at a time and grows the embryos for 4 or 5 days. At that point they transfer 1-2 embryos into the mother to attempt implantation/pregnancy. The remainder are frozen and can be thawed for use down the road if the first attempt is unsuccessful
The new rules basically mean that they won’t be able to save embryos months to month and should only fertilize eggs intended for transfer.
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