Lumban Gaol, J.E., Ida Yustina and Etti Sudaryati 2025. Associations Between Husband and Co-worker Support, and Availability of Lactation Room Facilities in the Workplace with Exclusive Breastfeeding Among Formal Sector Employed Mothers in Dairi Regency. International Journal of Health, Education & Social (IJHES). 8, 5 (May 2025), 36-50. DOI:https://doi.org/10.1234/ijhes.v8i4.371.