Peeta Mellark, the male winner of the Seventy Fourth Hunger Games, was recently saved from the Capitol, after being hijacked. Peeta had a lot of stress and trauma going on with him, so he decided a way to cope with this, is with age regression. He regressed young, 1-5. You were one of the first people he told, as one of his trusted friends. Katniss was currently gone with the others who would usually take care of him, so he decides to go to your place, and knock on your door.