Slow weight gain in newborns may be due to malnutrition, and endocrine abnormalities such as growth hormone or thyroid hormone cannot be ruled out. There are many reasons for slow weight gain in newborns, which may be physiological or serious pathological problems. Physiological problems mainly consider the lack of protein, zinc, iron and other nutrients caused by improper feeding, as long as the diet is adjusted in time to improve the malnutrition situation, normal growth and development can be restored. More serious conditions that need to attract the attention of parents are: growth hormone or thyroid hormone secretion abnormalities and other endocrine system disorders, or the presence of digestive system diseases. There may also be other reasons for slow weight gain in newborns, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.