It is normal for a postpartum mother to still be able to express milk one month after weaning. Prolactin levels in breastfeeding mothers will gradually decrease after delivery, but will still be higher than before pregnancy, especially when the baby sucks on the milk. If a mother is weaned, her prolactin level drops to pre-pregnancy levels in about two weeks. However, most mothers can still express a little milk six months or even a year after weaning, and this is normal. If milk is still being produced after the above period, it is important to consider the possibility of abnormalities. For example, endocrine disorders, pituitary microadenoma, hyperprolactinemia, etc. You should visit a hospital to further clarify the specific situation.