Several reliable, evidence-based resources are available to help you check the compatibility of medications with breastfeeding. Websites such as e-lactancia.org, MotherToBaby, the U.S. National Library of Medicine's LactMed database, and the Breastfeeding Network provide detailed fact sheets and research-backed information. Always cross-reference your specific medication with these resources and consult your prescribing physician to ensure the safety of your baby.