The causes of low breastfeeding in Indonesia are the lack of knowledge of pregnant women, families and communities about the importance of breastfeeding, giving weaning food (MPASI) before their time and lack of support from the community, including institutions where working women have yet to provide opportunities and special rooms for breastfeeding. This research is an analytical descriptive with cross sectional design. The population in this study is women health workers in Bandar Lampung City who have babies aged 7- 24 months. The sample of this research is taken from seven health center in Bandar Lampung city of 113 respondents. The research data shows the percentage of exclusive breastfeeding for women health workers (57. 4%). The variables associated with exclusive breastfeeding include knowledge of 72.8%, and a positive attitude of 72.1% (predisposing factors). The variables associated with exclusive breastfeeding on the family support factor (factor of strengthening) were 75, 7%, leader support 65, 9% and peer employee support to 68, 8%. There is no correlation between the availability of facilities and lactation management training (pushing factors) on breastfeeding. The most dominant factor associated with exclusive breastfeeding is knowledge. Mothers with good knowledge have an opportunity to be able to give exclusive breastfeeding 13 times greater than mothers who have less knowledge.