Why don’t all embryos grow the same?

It's a great question, and one we receive a lot! Although patients may have several embryos developing post-IVF retrieval,, they all don't always reach their full potential. Embryos may look similar at some stages, but differ greatly over time, due to chromosome imbalances or from simply lacking "energy". The following video illustrates this; the embryo on the right develops in a healthy manner, while the example on the left fails to continue growing.