Fingerprints form before birth in the womb

Fingerprints, unique ridge patterns on fingertips, develop during fetal development rather than being inherited or genetically predetermined. Between weeks 10-25 of gestation, ridges form through interaction between growing epidermis and underlying dermis. The process involves genetic factors and random developmental factors—fluid movements in amniotic fluid, precise fetal position, and pressure variations. Even identical twins with identical DNA develop completely different fingerprints because random developmental factors are not identical. This genetic-plus-random combination creates unique fingerprints remaining unchanged throughout life, with only minor wear and scar formation altering appearance. Permanence and uniqueness make fingerprints invaluable for forensic identification and security applications.