So that I don't miss out on kids' shoe sales when I am out shopping without my daughter I periodically trace her feet on a piece of paper, cut it out and tuck it in my purse. Then if I see shoes on sale I just measure up the soles.
I would not recommend this as there is much more to shoe sizing than length. You also have to check the arch support, the height of the back of the shoe so it does not hit the bone on the ankle. Take the child to the shoe store to try on. Feet are delicate and important.
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