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Growth Chart! $35 - fabric growth chart (do one for each kid and give to them when they grow up)
i like the split pins (or even nails) and swing tags to mark height. Write date & age on swing tag.
very cool tutorial for a fabric growth chart. I can't sew, or embroider, so I will be using fabric glue and paint, or something along those lines... but this is a great starting off point.
DIY Growth Chart from mdf. I think I might have to take another look at all of those thin, painted, wood pieces they have next time I'm at Michael's. They would be so cute going down the side of this. Maybe even to mark each foot?