【Objective】 To investigate general situation of complementary feeding of infants in Chengdu and compare the impacts to the physical growth of infants causing by the time of complementary feeding. 【Methods】 Datas of infants born in the period from January toDecember of 2009,who have had the physical examination at Department of Child Health Care of Sichuan Maternal and Child Health Care Hospital,were collected retrospectively,to longitudinally monitor the values of weight and height as well as the head circumference.In the meanwhile,the information about feeding was also checked and recorded. 【Results】 91.78% of parents added complementary food to the infants during their 4~6 months,and 78.6% of parents chose cereal as their first solid food.The figures of weight and height of group 4~6months were higher,averagely,than those of group <4 months in the time of 4,6,12 month.And the monthly increment of weight and height figures of group <4 months was lower than those of group 4~6 months from 1~4 months. 【Conclusions】 In the urban area of Chengdu,the problems exist that the first solid food is not correctly chosen as well as the time when adding the solid food is not appropriate among the few infants.Moreover,it also concludes that the time when adding the solid food is relative with physical growth.