Damn, and for hordies? There is also a NPC with "children's week" quests for horde? Beside NPC in Orgrimmar Orphanage.
Still got whistle in my backpack... If I will not be able to take more quests... I'll keep that little, stinky creature as a pet.
"note that if you don't do the quest chain the orphan stays in your inventory after childes week and you can summon him whenever you want to, like a normal pet."
"Do remember that the post above was written in patch 2.1.3, the item probably didn't have a set duration then."