Objectives:The aim of this implementation project was to improve breastfeeding support, and more specifically, to increase compliance with the Baby-Friendly Hospital Initiative (BFHI) and the requirements of the International Code of Marketing of Breastmilk Substitutes (the Code).Introduction:The Ten Steps to Successful Breastfeeding of the BFHI have been shown to improve breastfeeding outcomes at target hospitals. The Code is a minimum standard for the regulation of marketing practices related to breastfeeding support.Methods:We used the JBI evidence implementation model to identify a group of stakeholders in a hospital in the Czech Republic and carried out a best practice implementation project from January 2021 to May 2022. After conducting a baseline audit, the clinical team and external breastfeeding experts discussed challenges and devised an implementation plan using the JBI Getting Research into Practice framework. Follow-up audits were undertaken from January to December 2021 and in May 2022.Results:Compliance improved across all audited criteria, namely, to fully comply with the Code (0% to 100%); to have a written infant feeding policy (0% to 100%); to ensure staff have skills to support breastfeeding (0% to 100%); to discuss breastfeeding with pregnant women (0% to 100%); to facilitate skin-to-skin contact (67.86% to 83.58%); to support and provide help with breastfeeding (67.86% to 82.09%); to not provide fluids other than breast milk (50% to 58.21%); to practice rooming-in (57.14% to 61.19%); to respond to infant cues (50% to 64.18%); to provide information about community support services (32.14% to 62.69%); and to coordinate discharge and ongoing care (0% to 100%).Conclusions:Breastfeeding support requires a sustained long-term effort before it can become fully established. The involvement of national-level policy makers is needed.