Slow weight gain in some babies is normal and does not require special treatment. If it is caused by malnutrition, pediatric Down’s syndrome, etc., general care and medication should be strengthened. 1. Normal phenomenon: Due to individual growth differences, some babies with delayed physical development and low birth weight will experience slow weight gain and do not need special treatment. 2. Malnutrition: Malnourished babies will experience slow weight gain. If breastfeeding, the mother should pay attention to balanced diet to improve the quality of milk. If the baby has already added complementary food, it is necessary to supplement the nutrients that the baby lacks. If the malnutrition is severe, the baby can be supplemented with relevant preparations as prescribed by the doctor, and parenteral nutrition can also be used. 3. Pediatric Down’s syndrome: the disease will lead to growth retardation, which can be manifested in the baby’s slow weight gain. At present, there is no effective treatment program for this disease, but we can provide long-term patient education, ensure balanced intake of nutrients, mastery of life skills and so on. There are many reasons for slow weight gain in babies, so it is recommended to consult a doctor in time for examination, and follow the doctor’s instructions for treatment after clarifying the disease. Pay attention to the reasonableness of the daily diet to ensure a balanced intake of nutrients.