The third day after giving birth to a child, the milk swelling pain is still hard may be the mammary gland lactation function is poor, the milk tube is blocked, mastitis and so on causes, can through more sucking milk, hot compresses and massage, medication and so on the way to treatment. 1. poor lactation function: the third day after the birth of the lactation hormone level is relatively low, the function of the mammary gland secretion of milk is relatively poor, there may be the performance of the milk swelling pain and hard, can increase the number of breastfeeding, let the baby suck more milk, stimulate lactation secretion increase, to be lactation hormone secretion to reach the normal, the milk swelling pain and hard symptom will be improved. 2. Breastfeeding ducts are clogged: the breast ducts are already open on the third day after the birth of a child, and there are crystals, foreign bodies, and milk knots in the ducts, which can lead to breastfeeding ducts being clogged, and the milk can’t be discharged normally, so there will be a performance of breastfeeding pain and hardness. 3. Masturbation: The third day after the birth of a child, there is a blockage of the milk ducts, poor breastfeeding hygiene habits, bacterial invasion and infection caused by inflammation, will also have the performance of the milk, hot compresses and massage of the breast at the same time can be followed with ceftriaxone sodium and other drugs anti-infection treatment. The reason for this is the fact that there are many reasons for the increase in the number of people who have to pay for the services of the company, and the fact that the company has to pay for the services of the company.