Objective To analyze influencing factors of overweight and obesity in infancy. Methods analyze medical m anual of 533 infants in our hospital including height, weight, feeding history and anemia status. Results BMI value of 1 year o ld baby boys and girls showed statistical significance. Anemia is one of influence factors of overweight at age of 6 months and 9 months. Through logistics regression analysis, BMI increment of 0~3 months and 3-6 months is one of influence factors of over weight at 1 year old. C...