Abstract: Objective To investigate the influencing factors of allergic diseases in infants aged 0-24 months in Tianjin, and to provide scientific basis for disease prevention and control. Methods From November 2017 to June 2018, a stratified convenience sampling method was used to conduct a questionnaire survey among mothers of infants aged 0-24 months in Tianjin, including allergic diseases in infants and related influencing factors. Descriptive epidemiological analysis method was used to analyze, and univariate and multivariate analysis were used to analyze the influencing factors of infant allergic diseases. Results A total of 400 infants aged 0-24 months in Tianjin were investigated, 58.5% were boys, 32.5% were 7-12 months old, and 82.5% lived in the urban. Among them, 149 children with allergic diseases, the prevalence rate was 37.3%. Multivariate Logistic regression analysis showed that infants aged 0-6 months （OR=1.998） had a higher risk of allergic diseases; and those living in the urban （OR=0.517）, knowledge of exclusive breastfeeding for at least 4-6 months reduced children's allergic risk （OR=0.303） and pregnancy supplementation with probiotics （OR=0.511） had a lower risk of allergic diseases （P<0.05 or P<0.01）. Conclusion The incidence of allergic diseases in infants aged 0-24 months in Tianjin is high, and the risk can be reduced by living in the urban, breast feeding for at least 4-6 months and supplementation of probiotics during pregnancy. More attention should be paid to the risk of allergic diseases in infants aged 0-6 months.

Key words: Infants, Allergic diseases, Influencing factor