Kids Clothing Sizes by Age, Height & Weight
Convert kids clothing sizes across US, UK, and EU by age, height, and weight. Use our free children's size converter for accurate shopping from newborn to teen.
Shopping for kids clothing across international brands can be tricky when every country uses a different sizing system. Whether you need a baby gift from overseas or are ordering school uniforms from a European retailer, our kids size converter helps you match sizes by age, height, and weight.
Age-Based Versus Measurement-Based Sizing
Most US kids clothing is labeled by age (12 months, 2T, 4, 6, etc.), with height and weight ranges listed on the tag. EU and UK brands typically label by height in centimeters (50, 56, 62, etc. for babies; 92, 104, 116, etc. for older kids). Age is a rough guideline, but height gives a much more reliable fit. For the broadest compatibility, use our kids size conversion tool to translate between all three systems.
Newborn to Teen: Sizing Across the Stages
Baby sizes (preemie to 24 months) rely heavily on length and weight since babies grow rapidly. Toddler sizes (2T to 5T) add waist and hip considerations for potty-training ease. Youth sizes (6 to 16) transition toward adult-like proportions. For teens who have outgrown kids sizing, our adult clothing size converter may give a better fit using chest, waist, and hip measurements.
Measuring Your Child at Home
For the most accurate conversion, measure your child's height, chest, waist, hip, and inseam. Have them stand against a wall for height and use a soft tape for body measurements. Compare your numbers against the brand's size chart rather than relying on the age label. Update measurements every three to six months during growth spurts to keep sizes current.