NIKE Size Chart Infant/Crib Sizes: 0, 1, 2, 3 Toddler Kids Sizes: 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10 Preschool Kids Sizes: 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 1, 1.5, 2, 2.5, 3 Gradeschool Kids Sizes: 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7