The redness of the lower eye bags of infants is mainly considered to be caused by physiological factors such as lack of sleep, crying babies, or local allergies and bacterial infections. 1. Physiological factors: lack of sleep can easily make children depressed, or babies crying, tears stimulation leads to the redness of the lower eye bags. 2. Localized allergies: the baby’s eyes come into contact with allergic substances, such as dust, animal hair, etc., resulting in allergies and redness of the lower eye bags. 3. Bacterial infection: Babies’ eyes are infected by bacteria, resulting in eye infections and inflammation, such as conjunctivitis, which causes redness under the eyes. Redness under the eyes of infants may also be caused by other reasons, parents are advised to pay more attention to the baby’s situation, in order to rule out physiological factors should be timely to take the child to the doctor for treatment.