Most women experience breast distention during breastfeeding, but if they suddenly stop distending and become flaccid, it may be caused by the emptying of milk, the reduction of milk secretion or the discharge of pus from the breast. If you have just fed your baby or have just emptied your milk with the help of a breast pump, it is normal for your breasts not to swell and become flaccid, and no special treatment is needed. In most people, milk will refill the breasts after 2-4 hours, resulting in a feeling of distension. The time to refill may vary from person to person, so just feed your baby as needed.1. Dietary factors: If you have consumed a lot of fried malt or certain foods that are not good for milk secretion, you should stop eating the relevant ingredients and continue breastfeeding to gradually recover. If it is caused by insufficient energy intake, single nutrition and other factors, you need to gradually increase lactation by ensuring sufficient and balanced energy intake, increasing the proportion of meat, eggs, fruits and vegetables, and increasing the consumption of soups, etc.; 2. The influence of drugs: such as bromocriptine, vitamin B6 or estrogenic drugs can inhibit the secretion of milk, immediately stop using these drugs, it is recommended to consult your doctor whether you can continue to breastfeed. If you resume breastfeeding after the drug is metabolized, you can let your baby suckle more every day to stimulate and help milk secretion; 3. Emotional influence: emotional tension, excessive stress and other factors can also lead to reduced milk secretion, making the milk suddenly not swollen and become loose, you should maintain emotional stability and try to ensure normal rest or have more than 8 hours of sleep daily, which can promote milk secretion. Leaving the baby for a long time without breastfeeding and losing the neuropsychological stimulus needed for lactation can also cause milk return, so you should avoid the above triggering factors and ensure time with the baby. In addition, if pus accumulates in the breast, after treatment and discharge of pus, the milk may suddenly become soft and not swollen, which is a sign of improvement and requires no special treatment.