Shop confidently with our Kids' Size Guide that helps you find the best size for your little one. We want all kids feel comfortable in their boys' clothes and girls' clothes, whether it's boxer for boys or bralette, pair of jeans or skirt. The Kids' Size Guide provides detailed measuring instructions so you know how to measure correctly and can find the perfect fit for every item, with every purchase. The perfect fit for your little one is just a few measurements away with the Calvin Klein Kids' Size Guide.