On the fourth day of weaning, you should consider that there is milk stagnation and the residual milk is not drained in time to stimulate the reactive hyperplasia of breast tissue, resulting in hard lumps in the breast. At this time, you should apply hot towels and massage your breasts under the guidance of a professional lactation specialist. You can also take appropriate amount of milk returning soup or medicine to promote the return of milk and speed up the discharge of residual milk as soon as possible to avoid acute mastitis. At the same time, you should keep a relative distance from your baby to avoid the lactation reflex caused by the baby crying, which will lead to an increase in milk secretion. In daily life, you should avoid squeezing or bumping your breasts to avoid acute breast injury, and avoid eating too much high-fat and spicy food. You should have good habits, go to bed early and wake up early, avoid staying up late, and wash your nipples in time to keep them locally clean.