Your unique fingerprints form by chance in the womb

Science
Your unique fingerprints form by chance in the womb

Your unique fingerprints emerge randomly in the womb, shaped by subtle environmental factors, ensuring no two people share identical patterns—even identical twins.

Every human fingerprint is truly one-of-a-kind, even for identical twins. These distinctive patterns begin forming randomly between the 10th and 16th weeks of pregnancy. While genetics provide the basic skin blueprint, unpredictable environmental factors inside the uterus, like a fetus's position or amniotic fluid flow, sculpt the unique loops, whorls, and arches.

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