Are you consistently not getting past Day 3 in IVF? You get the fertilization report, you breathe for 48 hours, and then everything stalls. You refresh your portal. You wait for the call. And you hear the same words again: “They stopped growing.” Most people are told this is just “bad luck” or “egg quality.” But that is not the full story for many couples. Day 3 to Day 5 embryo arrest often comes from modifiable biology in either partner: • Oxidative stress that drains the embryo’s mitochondrial