Thought it would work on my wife and daughter but had to return as the sizes are a joke for a size range. As does my not 5 year old half Vietnamese daughter who weighs less than half her weight - 28 pounds. couldn't fit it. So I don't know what would suit a 7 year old. I don't think this would work if my little girl was 3, she is not designed well enough to have enough room to handle her bike unless you are 6ft tall.
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