UK, 3 Junior, 4 Junior, 5 Junior, 6 Junior, 7 Junior, 8 Junior, 9 Junior. Determine your youth/junior shoe size with our Youth/Junior Shoe Size Chart (US , UK, European shoe sizes). Check out our junior size chart and fit guide to help you confidently choose the right. Looking for the freshest pair of kicks for the kids? Shop our collection of junior footwear in sizes 3-6. Shop Kids - Nike Junior Footwear (Sizes 3-5.