Abstract: Objective To assess the influence of mothers’ different sociodemographic backgrounds, their own oral health habits, feeding habits and oral health status on their onemonth infants’ risk of dental caries. Methods Onemonth infants and their mothers from Huangpu district in Shanghai were involved in the study. Information was collected using questionnaires. Oral clinical examinations were performed and Plaque samples of mothers and their infants were also collected to assess their level of risk on dental caries. Results A total of 165 onemonth infants and their mothers participated in this study. 10.3% of onemonth infants and 41.9% of mothers were in the high risk of dental caries. DMFS of mothers ranged from 0 to 26 with a mean of 2.7±3.9. Mean values of VPI and BOP were 0.42±0.19 and 0.14±0.15.The result of the multivariable Logistic analyses indicated that the infants who were born underweight (OR=6.5, 95% CI=1.5-29.3), fed with nursing bottle more than 5 times every day (OR=5.1，95% CI=1.3-19.5), and their mothers who had more than 25% of site with bleeding (OR=4.7, 95% CI=1.3-16.8) were in the high risk of dental caries. No other sociodemographic background, oral health habits, and feeding habits were significantly associated with onemonth infants’risk of dental caries (P＞0.05). Conclusions A number of onemonth infants have high risk of dental caries. Underweight when they were born, frequency of feeding with nursing bottles and mothers with serious gingivitis are associated with onemonth infants’ risk of caries.

Key words: early childhood caries, risk of dental caries, mother, multivariable analysis