Redness in the ears of infants may be a normal physiological phenomenon, or it may be related to infections. 1. Normal physiological phenomenon: the baby’s own ear capillaries are more abundant. When the ambient temperature rises, the capillaries expand and the blood flow speeds up, which may lead to red ears. 2. Infection: Infants’ immunity is relatively low, and pathogenic microorganisms such as bacteria and viruses can easily invade the organism and induce an immune response, leading to otitis media, otitis externa and other diseases. Localized inflammatory stimuli may also lead to redness in the ears of infants. There may be other reasons for redness in the ears of infants, 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.