Oral thrush is an infection caused by Candida albicans due to certain specific conditions, such as a weakened immune system or long-term malnutrition, prolonged use of broad-spectrum antibiotics or corticosteroid hormones, and dysbiosis in the intestinal flora. It primarily manifests as white patches on the oral mucosa. During breastfeeding, if Candida contaminates the nipples or nursing equipment, it can also lead to oral thrush. Generally, oral thrush is not highly contagious. It is recommended to maintain good hygiene and proper oral care. Generally, breastfeeding is not significantly affected under normal circumstances.