You can't believe it at first, but this red-haired tyke in the mirror moves exactly like you do, and everything looks too big for you to be your adult size. Pulling a lock of the tangled copper hair down in front of your eyes, you confirm the color. Then you feel your smooth face and probe a gap in your gums where a front tooth has fallen out. Everything feels real to you. Curious, you tug off the costume and stand naked in front of the mirror. The little boy you have become is slender and pale, with freckles all over. Pug nose, ears like teapot handles, and the wild mass of hair combine with pale blue eyes that look a little unfocused. You look like you are not too smart, maybe even mildly retarded. But you feel the same, and seem to have all of your memories.
"Davy!" A teenage boy with hair much like yours comes around the corner and scowls. "Mama told you to keep your clothes on in town!" You can see some similarities in your faces, but he has bright blue eyes that look intelligent. Obviously an older brother, maybe 15. He grabs your clothes up and sits on the floor in front of you. "Come on, squirt! Let's get you dressed again before anyone sees you in your birthday suit!"
You giggle, and catch yourself. This isn't funny. And how are you supposed to fit in your grown-up clothes... your mouth falls open as you see he is holding up a pair of pull-ups with Batman logos on them. Your clothes have changed as well. It seems that Davy is now yet fully potty trained!