Background: In different parts of Ethiopia employed mothers wean breast feeding earlier thanrnunemployed mothers due to early returning to work after child birth. A recent World HealthrnOrganization (WHO) internal employeeâ€Ÿs based study recommended that the employer shouldrnprovide, prenatal/ postpartum services, which include separate rooms for breastfeeding, nurseryrnchildcare and provide flexible time and lighter job to working mothers. rnObjectives: To assess health care service working mothers exclusive breast-feeding practicernand determining factors and their perception towards the breast-feeding support program at work rnplace in Governmental hospitals in Addis Ababa, Ethiopia 2020 rnMethods: A mixed methods research of institutional based cross sectional quantitative studyrndesign supplemented with qualitative method was conducted in Addis Ababa Governmental rnhospitals. For the quantitative portion the sample size was estimated using a single populationrnproportion formula and become 403. For the qualitative, in-depth interview was done forrnworking mothers having child less than 2 years until information of interest is saturated. Simplernrandom sampling technique was used for the cross sectional quantitative research design andrnpurposive sampling for the qualitative. The data for the quantitative was collected using a face tornface interview questionnaire and semi-structured interviews for the qualitative data. For thernqualitative, during dada collection period, the obtained data through Interviews was audio tapedrnby digital sound recorder. Descriptive statistics such as frequencies, proportions, and measures ofrncentral tendency and measures of variation used to describe the distributions of variables. Thernlogistic regression model was used to assess the relation between dependent and explanatoryrnvariables. The qualitative data analyzed using content analysis. rnResult: Only 95(24.1%) continue EBF after returning to work and majority of them stop EBF beforernsix months due to work related reason 270(89.9%) while the rest were due to different reasons 30(10.rn15%). The odds of discontinuing EBF after return to work is 8 times higher (OR: 7.98, 95% CI rn1.64-38.90) among women who works in shift compared to women who works by the regularrnoffice hours. With all the importance that the mothers mentioned about the breast feedingrnsupport program but they prefer not to use the program due to cleanliness issues and transportrelatedrnproblems.rnrnrnConclusion: Health care service working mothers discontinue EBF before 6 month due torndifferent reasons but mainly due to work related reason and mothers intention to use the breast rnfeeding support program which helps mothers to continue EBF is affected due cleanliness issues,rntransport difficulties, hospital acquired infections and work overload.