Redness under baby’s eyes may be caused by conjunctivitis, blepharitis, upper respiratory tract infection and other diseases. 1. Conjunctivitis: after conjunctivitis, the inflammation leads to conjunctival congestion and edema, causing dry, itchy and painful eyes, and redness under the baby’s eyes. 2. Blepharitis: patients with blepharitis, the production of a large number of inflammatory mediators, stimulation of the conjunctiva, resulting in conjunctival congestion and edema, appearing redness under the baby’s eyes. 3. upper respiratory tract infection: some patients with upper respiratory tract infection will cause nasal congestion, sneezing, resulting in local vascular pressure, causing eye congestion and edema, redness under the baby’s eyes. Parents usually need to observe the baby’s situation, if the baby’s eyes under the redness is heavier, it is recommended to consult a doctor in time, under the guidance of a professional doctor to clarify the diagnosis and targeted treatment.