The absorption time of milk held in the breasts is related to the amount of milk and the mother’s constitution. If the milk is small, it can be fully absorbed within a few days, while if the milk is large, it may take several months. Holding back milk can be a detriment to a woman. Because pregnant women produce milk at different rates, milk in the breasts is generally absorbed at a slower rate just by itself. If the milk is held back for too long, it is easy for the milk to stagnate, which may lead to breast discomfort, fever and other manifestations, or even diseases such as mastitis. Therefore, breastfeeding women should avoid holding back their milk as much as possible. If the amount of milk is small, it can be completely absorbed in a short time; if there is a lot of milk, it is recommended to use a breast pump to extract it cleanly; if there is the occurrence of diseases such as mastitis, you should go to the hospital in time.