If you have yellow milk after 8 months of weaning, it may be a normal symptom caused by residual milk, or it may be an abnormal symptom caused by mastitis or hyperprolactinemia. 1. the residual breast milk: a small amount of residual breast milk may accumulate in the milk ducts after 8 months of breastfeeding, when squeezing the breast, it may cause the residual breast milk to be discharged through the milk ducts, which may lead to the discharge of yellow breast milk after 8 months of breastfeeding, which may be a normal phenomenon. 2. Mastitis: After 8 months of breastfeeding, if a woman develops mastitis caused by bacterial infection, the inflammatory secretions in the milk ducts will increase, and she may discharge yellow milk, which may be accompanied by fever, breast swelling and pain and other symptoms. 3. Hyperprolactinemia: After 8 months of weaning, if a female patient develops hyperprolactinemia, the body prolactin increases significantly, which may promote the secretion of yellow milk. If a woman is weaned for 8 months and still has yellow milk, she needs to go to the local public hospital in time for diagnosis and treatment.