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Growth Chart! $35 - fabric growth chart (do one for each kid and give to them when they grow up)
Wooden Ruler Growth Chart. What a great idea! You keep it stays with the "growing" family if you move!
DIY Ruler on a stick. Want this in my house one day for my future kids :) I'd keep it forever, wherever i moved to
growing up (and still to this day!) we mark a wall in my grandma's house to track our growth. while I stopped growing about 15 years ago, it is still fun to stand up and have my dad or brother mark where I am. this is a cute diy: Turn a 2x4 into a large ruler for the wall, and record the height of your kids as they grow. You never have to worry about moving to a new house.
DIY Wooden Growth Chart Tutorial - Classy Clutter