Four-year-old baby eyes keep blinking, may be conjunctivitis, dry eyes, inverted eyelashes and other diseases. 1. Conjunctivitis: If the baby rubs his eyes with unclean hands, the pathogenic bacteria enter the body to appear inflammatory reaction. Typical clinical manifestations of conjunctivitis include tearing, redness and swelling of the eyes, and photophobia. The photophobia caused by conjunctivitis can cause the baby’s eyes to blink all the time. 2. Dry eyes: Dry eyes can be caused by the baby’s dry environment or the baby’s eyelids turning out. Dry eye syndrome will appear dry eyes, foreign body sensation and other symptoms, patients need to increase the frequency of blinking to constantly moist eyeballs. Therefore, babies with xerophthalmia may have the phenomenon of blinking all the time. 3. Inverted eyelashes: children with inverted eyelashes will be due to the growth of eyelashes inverted to the eyeball irritation of the eyeball, and there is a fear of light, tearing, foreign body sensation and other symptoms, the child will be blinking repeatedly in order to alleviate the symptoms of discomfort. Four-year-old baby’s eyes keep blinking, can also be seen in other causes, parents should take the child to the doctor in time, in the doctor’s diagnosis and guidance for related treatment, so as not to delay the condition.