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Presuming you're not a chimera http://en.wikipedia.org/wiki/Chimera_(genetics)

Unless you're one of a set of twins/triplets/etc.

append datetime string of birth. Boom problem solved.

What if the twins are delivered via Caesarean, with the exact same datetime recorded? Including datetime (even as a string) also includes the aforementioned falsehoods about time.

unless you have a twin, or other tuplet siblings.

or a clone:)

Unless you're a twin