Physiological milk distention usually lasts for about 3-4 days, but there may be differences depending on the individual’s physical condition and other factors. Physiological distention is mainly due to the fact that the breast glands secrete more milk and the milk ducts are blocked, so the milk cannot be discharged and may gather in the breast cavity, causing the symptoms of distention. In case of physiological breast distention, you should let your baby suck on the nipple more often so that the milk in the mammary glands can be emptied in time, and you can also massage the milk ducts in the areola position by yourself to make them clear. In addition, you can apply a soft towel soaked in cold water to your breasts after squeezing out some milk to relieve breast congestion and swelling, or you can use a warm towel for a few minutes after the congestion is relieved, together with gentle massage and patting movements to soften your breasts and areolas and reduce the feeling of breast distention. During the period of physiological breast swelling, women should keep a happy mood and avoid mood swings or excessive tension and anxiety, which may lead to insufficient secretion of pituitary lactogen, resulting in milk reflux and insufficient milk secretion, affecting the normal development of the baby and breastfeeding. It is recommended to eat a light diet, avoid greasy and stimulating foods, and not to drink too much milk-boosting soup, and to eat high protein, high fat and high sugar foods in moderation, so as to avoid excessive milk secretion or too thick, which may lead to milk clots in the breast gland. If your breasts are swollen, painful, full or feverish, you should report to your doctor for treatment.