I bought a vivofit jr for my 3 year old (mainly to satisfy my curiosity about how much he moves per day, but it was also useful for using coins in the app to do potty training reward), and I guess other reviews said this is the smallest fit you can find on Amazon. He is a slim 3 year old and although the small size is still loose it is still small enough to put on or take off over your hand, however you will need to stretch it considerably. The quality seems excellent so far. He is very active and rude and did not harm him.
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