Newborn babies always keep one eye open, it may be a normal physiological phenomenon, or it may be caused by facial nerve palsy, or photophobia. 1. Normal physiological phenomenon: Some infants may be born with one eye half-open without exposing the corneal ophthalmoscope. In the absence of any abnormality, the above phenomenon is mostly a normal eyelid closure insufficiency and does not need to be overly worried. 2. Facial nerve palsy: Due to head trauma or disease, the facial nerve is damaged, causing paralysis of the facial muscles, and the eyelid on the affected side may not be able to close completely. This may be manifested by the newborn’s keeping one eye open. 3. Photophobia: As the newborn’s body is not yet well developed, the eyes may not want to open hard when they are exposed to light. They may not want to open their eyes with force, which may be manifested by keeping one eye open. After a period of time, newborns will adapt to the situation on their own. If the newborn always opens one eye, it is recommended to observe closely, and if there is any abnormality, consult a doctor in time to confirm the causative factor, and follow the doctor’s instructions for symptomatic intervention.