【Objective】 To investigate the epidemic situations of obesity of infants from 0 month to 2 years old and its influencing factors in Shaoxing. 【Methods】 Cluster-random sampling was used to investigate 7 985 infants in all.Overweight and obesity were defined by the WHO weight for height standards. 【Results】 The rate of obesity among the infants was 2.64%,and the boys was 2.64% while the girls was 2.24%.The rate of overweight was 9.83%,and 10.50% for boys,9.06% for girls.There were significant differences in the prevalence between boys and girls (χ²_obesity=4.424,χ²_overweight=4.687,P<0.05).The detectable rate of obesity among the infants below 1 years of age showed a decreasing tendency with age.However,the rate showed a rising tendency among the infants who were older than 18 months.There were significant differences in the prevalence in different age groups (χ²_obesity=173.627,χ²_overweight=161.542,P<0.01).Obesity of children was correlated with high birth weight,the parent's BMI,big family and the parent's attitude towards obesity. 【Conclusions】 The detection rate of overweight and obesity is in higher level.The main influencing factors include high birth weight,the parental BMI,big family and the parental attitude towards obesity.