You decide you want to become a real baby.
"I was born in 2019 instead of 2003."
As soon as you write it you feel yourself change. Your body gets smaller and pudgier, and your already childish clothes shrink to fit your new body.
However, you forget one thing- Even though you are now 8 month old, your previous changes make it so you are essentially a newborn! Your clothes morph into nothing but swaddling cloth, and you begin to cry, because that is all you could do now. Your mom comes in, holding your now older sister. They both had gotten younger as well- your mom's face is less lined, and your sister looks to be 6 years old. Your mom looks at you, and says "Jakey, how'd you get on the floor?" She picks you up and lays you in your- now much smaller- crib. She looks at the notebook on the ground. "How did that get there?" she asks to no one in particular. She picks it up and places it on your changing table, along with the crayon. She leaves the room.
You reach out to grab the notebook, and are barely able to pull it and the crayon into your crib, with your poor, newborn vision. You think quickly, then write in the notebook, "The current year is 2050." You hope that this will make you be 30 years old- out of diapers and out of school. Does it work?