Baby under-eye blue may be physiological factors, such as thin skin, malnutrition, etc.; may also be pathological factors such as hemangioma, heart disease, anemia, etc.. 1. Physiological factors: children’s skin is delicate and thin during the growth and development period, and the color of skin veins and blood vessels will penetrate through the skin, which will be manifested as greening of the fundus. 2. Pathological factors: hemangioma in the fundus, localized blood vessel clusters in the skin will lead to greening of the fundus. Insufficient blood supply in congenital heart disease will cause poor blood circulation around the fundus, manifesting as greening of the fundus. The presence of iron deficiency anemia and other conditions in the child can also lead to the blueing of the fundus of the baby’s eyes. Parents are advised to take their children to the hospital to find out the exact cause of the bluish color of the fundus of the eye.