There's always this option.....
https://www.specialized.com/us/en/shop/bikes/kids-bikes/kids-mountain-bikes/kids-fat-bikes/c/kidsmfatboy
@Aroogah started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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There's always this option.....
https://www.specialized.com/us/en/shop/bikes/kids-bikes/kids-mountain-bikes/kids-fat-bikes/c/kidsmfatboy