Large bags under the eyes of infants may be due to genetic factors, but also may be due to lack of sleep, drinking too much water, kidney disease, and so on. 1. Genetic factors: If parents have big bags under their eyes, infants may also have big bags under their eyes due to genetic factors. 2. Lack of sleep: infants who have not had enough sleep for a long time and are in a state of fatigue may also have large bags under their eyes. 3. Drinking too much water: children’s kidney metabolism is weak, drink too much water before going to bed, and sleep in an improper position, which can also lead to large bags under the eyes. 4. Kidney disease: kidney problems, such as nephrotic syndrome, will lead to decreased urine output, excessive fluid in the body, puffy eyelids and large bags under the eyes. There may be other reasons for the bags under the eyes of infants, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.