|Bio: When Mordred banished all of the adults to another
dimension, Morgaine le Faye struck a deal with the Justice League: help
her defeat her son and everyone in this dimension will be sent back to
reality. Having no other alternative, the League agreed (despite some
balking from Green Lantern), and were transformed into child versions of
Containing all of the characteristics of their adult counterparts, but
half of the strength and more of that cuteness that make children so
loveable, the Justice League Kids succeeded over Mordred and were
eventually returned to their adult selves.
And yes, Baby Etrigran is a cutey.