The five Legion orphans are de-aged to toddlers and adopted by families who can't have children.
Story 1: The Five Legion Orphans!
While everyone is celebrating Parents Day, there are five orphan Legions who stand guard at the Clubhouse. They are asked to help capture some raiders who have stolen power crystals. They find the crystals under a body of water, but they longer they stay in it, the younger they become. They are placed in an orphanage and adopted until Brainiac 5, as a child, devises a way to change that, reverting them back to teenagers.
Story 2: Lana Lang and the Legion of Super-Heroes!