Children's clothing sizes are typically categorized by age, height, and weight. Common size labels include infant, toddler, and youth, with specific measurements for each category. For example, infant sizes usually range from newborn to 24 months, while toddler sizes cover ages 2 to 4. Youth sizes generally start at age 5 and can go up to 16 or more, depending on the brand. When shopping for children's clothing, it's essential to check the size charts provided by manufacturers, as sizing can vary between brands. Additionally, some clothing may be labeled as slim, regular, or husky to accommodate different body types.