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ent fat-free mass indicators. It is found that the association between timing for introducing complementary foods during infancy and the fat mass indicators of children aged 3 to 5 years was not statistically significant, and the association between timing for introducing complementary foods and fat-free mass may be inconsistent for different fat-free mass indicators. To develop the physical activity questionnaire for Chinese children aged 6-17 years old, in order to evaluate the children's physical activity. After systematic review, expe