Background: The Baby-Friendly Hospital Initiative (BFHI) is a World Health Organization and United Nations Children's Fund joint global programme to protect, promote and support breastfeeding. Sustainability of the BFHI standards is important for health facilities and country-level implementation. Aims: To analyse the 2018-2019 external reassessment results of baby-friendly hospitals (BFHs) in Turkey. Methods: We included 414 BFHs. The Ten Steps to Successful Breastfeeding were divided into 2 groups: critical management procedures (Steps 1 and 2) and key clinical practices (Steps 3-10). Results: All 10 steps were fulfilled by 60.1% of the hospitals. Steps 3 and 2 had the lowest compliance rates (81.6% and 85.7%), and Steps 7 and 8 had the highest rates (97.1% and 98.1%). Caesarean section rates in the fourth quartile were associated with significantly lower adherence to Steps 3 and 10. The presence of another external reassessment within 5 years was associated with a significantly higher adherence rate to Step 3, and a significantly higher full implementation rate for the clinical practices. Hospitals that fully implemented management procedures had a significantly higher fulfilment percentage for all clinical practices. The western region had higher adherence rates for all the clinical practices than other regions. Conclusion: Reassessments seem useful for sustainability. Full compliance with Steps 1 and 2 is important for higher adherence to the clinical steps. Regional variations should be taken into account in the implementation of the programme.