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I just recently had this whole discussion with my dr. We are MFI as well and did ICSI. We had great embryos for the first three days, and then they started slowing down by day five. From what i have gathered, it seems that although ICSI is an amazing process, where the embryologists are choosing the sperm that looks perfect, they might not actually be good sperm. They can only use human eye, but they can't see inside the sperm to know if there are any abnormalities or dna fragmentation. So what often happens in cases of MFI is that they pick sperm that look good and will fertilize the egg, but then they are not healthy enough to continue growing into a good embryo. With natural IVF, it is survival of the fittest, so the best and healthiest sperm will naturally fertilize the egg. However, you are risking the chance of none or very few fertilizing, especially with MFI. There are pros and cons to both, but most likely if you are MFI, your best bet is ICSI. GL
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