There is something so endearing about the simplest growth charts that you sometimes spy in homes - heights and dates ticked off with pen or pencil on a doorway or wall. But you can't take it with you when you move and you might be afraid to do it if you're a renter.
Using a mirror like Breanna of Dollar Store Mom did solves both those problems. You can probably figure out how to make it yourself, but she wrote up a full tutorial and materials list. Find it at Dollar Store Mom.
(Image: Dollar Store Mom)