Decreased milk intake and weight loss in preterm infants discharged from the hospital may be due to physiologic weight loss or the presence of some abnormalities, such as digestive system diseases. Under normal circumstances, newborns will experience a period of physiological weight loss, mainly in the first few days of life, during this period the newborn needs to adapt to the environment, the amount of milk is less, the body water is evaporated, but also the discharge of meconium, the weight will drop some, but in a week to two weeks after the recovery back to normal. In addition, the weight loss of premature babies may also indicate some abnormalities: 1. Insufficient breast milk nutrition: when the mother’s nutritional supplementation is not enough to lead to insufficient breast milk nutrition, it may also lead to infant weight loss, at this time, it is recommended that the mother to increase nutritional intake, and appropriately increase the number of times of breastfeeding, and as appropriate, to add some complementary foods. 2. Digestive system diseases: when the baby has some digestive system diseases, it may lead to poor intestinal absorption function, poor appetite, then there will also be weight loss; The specific situation varies from person to person, it is recommended to go to the hospital at the right time for systematic and comprehensive examination, and actively search for the cause.