Breastfeeding history, mother and children characteristics, and child care are considered influential on child intellegence. This study aimed to determine the proportion of exclusive breastfeeding, the level of childrens intellegence, mother and children characteristics, the relationship between duration of breastfeeding with the level of students intellegence. This research used a cross-sectional design and through systematic random sampling with a sample size of 166 respondents (students aged 7 - 9 years old) and their mothers. The intellegence was tested using the Raven test while their mothers were interviewed. The results showed that the level of childrens intellegence was high (57.2%), average (36.7%), and low (6%). Those variables which related to the intellegence level were duration of breastfeeding and the level of mothers education. The mothers education level is one of the factors which has higher effect, againts the childrens intellegence. Those mothers who have high level education will have probability 3,556 to have their children with high level intellegence (after controlling the duration breastfeeding). Suggestion; The Department of Education Bekasi city to organize activities relevant to the improving of parents in growth and development of their children through seminars/training/counseling.