I have never made wooden growth charts and I surprised myself with the end result. I purchased two 1" x 8" x 6' boards and sanded the boards smooth.
I taped down the board and using a small roller, rolled the pink on. After that dried I taped down on the pink and rolled on the white. I used a piece of clear sheet protector to make a template, then I made myself a projector using a shoe box and a lamp. The bathroom doesn't have a window so I went in there and set up the projector onto the wood and traced the stripes onto a sheet of paper for practice and realized I had to mark the dark spaces because they just start to run all together. I used a marker for the inch lines and stickers for the numbers. A coat of Modge Podge matte and they are finished.