Board Thread:Theories Discussion/@comment-13376834-20130430230244/@comment-6192846-20150810033930

No problem.

That's always possible, though we don't know what Irregular necessarily is so whether the Clockwork Lullaby girl ties to any theories brought up is still possible, and we still can't rule out she is any character that's already been introduced.

Actually, with the speculation about the only child in this thread, it'd be interesting to see this be the character, though her survival past birth (let alone the Catastrophe) leaves much room for doubt and speculation alike.