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When Does the Baby’s Gender Get Decided? | X vs Y Sperm Battle Explained Scientifically The gender of a baby is determined in the very first microscopic moment after fertilization. In this realistic 3D educational video, discover how millions of sperm race toward a single egg — and how one tiny chromosome, X or Y, decides whether the baby will be a girl or a boy. Learn why Y sperm are faster but weaker, and X sperm slower but longer-living — a true biological race that defines life itself. #Baby