The rate of exclusive breastfeeding up to 6 months of age in Indonesia remains low, which is 49.8% in 2015. Maternal employment and low family socio-economic status were associated with shorter duration of breastfeeding. Majority of women still face many obstacles to continue breastfeeding their babies when they return to work. The government has made a regulation for workplace to support exclusive breastfeeding and must provide special facilities for breastfeeding and/or expressing breast milk. However, only 21.5% of the female workers confirmed the availability of breastfeeding facility, and 7.5% had been in contact with a breastfeeding support program. In order to increase exclusive breastfeeding practice among female workers, we have conducted a project called Breastfeeding Friendly Factory (BFF) with a funding from World Alliance for Breastfeeding Action (WABA). The specific objectives of this project are to gain support from the employer to implement breastfeeding friendly factory, to train health provider in the factory to become breastfeeding counsellor, and to raise awareness among employees to breastfeed their baby exclusively. There are three main activities to achieve the goal, namely advocacy meeting, capacity building and health promotion. We implemented this project in PT Marimas, Semarang, Indonesia. We collaborate with the Public Health Center to continue and to ensure the sustainability of this project. After advocacy meeting, we assist PT Marimas to develop a policy about exclusive breastfeeding among female workers. PT Marimas has agreed to provide a lactation room and give flexible time to their female employees to express or pump breastmilk. Furthermore, we set up a group of volunteers and train them to become counsellor in lactation and to manage a lactation room. The lactation room has been equipped according to MoH regulation. At the end, we provide health promotion to female workers about the important of exclusive breastfeeding and how to success breastfeeding at work.