The size of children's clothing (including infant clothing) in China is marked according to the national standards GB/T 1335, 3-2009 Clothing Size Children.

Clothing size is a unique size marking method in China. Size refers to the height of the human body, expressed in centimeters (cm), which is the basis for designing and purchasing clothes. "Type" refers to the bust or waist circumference of the human body, expressed in centimeters (cm), which is the basis for designing and purchasing clothes. Numbers and types are separated by a diagonal line.

For example, the size "Shangzhuang 1 10/56", where "1 10" stands for "size" and "56" stands for "type" (the size of Shangzhuang refers to bust). The size is "bottom 1 10/53", where "1 10" stands for "size" and "53" stands for "type" (bottom type refers to waist circumference).