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There’s a This American Life story about a mom who was keeping track of which twin was which using diaper pins. When she took them in for a checkup, they changed the diapers for her and handed her the pins afterward. So she guessed!
https://www.thisamericanlife.org/691/gardens-of-branching-paths/act-three-27
See that’s why you gotta think ahead and brand one of them with the hot safety pin.