DIY-Growth-Chart: I've been eyeing these on Etsy, but at the price they're selling for we could totally buy the stuff we need to make this! And the orbital sander!
CUSTOM Painted Ruler Growth Chart / Wood Growth Chart by RouxBeeLu
DIY Growth Chart Ruler AddOn Custom by LittleAcornsByRo on Etsy
Free growth chart printable-cute to measure as they grow!