Frequent blinking of three-year-old babies may be caused by eye inflammation, impingement, astigmatism, eye fatigue and so on. 1. Inflammation of the eyes: such as infectious conjunctivitis, keratitis, causing eye congestion, increased secretions, pain, dryness and itching, etc., the discomfort of the eyes will cause the baby to blink frequently. There is also allergic conjunctivitis, if contact with allergens caused by itchy eyes, there will also be blinking. 2. Inverted eyelashes: some babies’ eyelashes grow inward, the lower lid inverted eyelashes, eyelashes stimulate the cornea of the baby’s eyes caused by eye discomfort, can lead to frequent blinking performance. 3. Astigmatism: some babies have astigmatism in the eyes, in the bright light or look at things for a long time will appear blinking performance. 4. eye fatigue: some babies watch TV and electronic products for a long time, resulting in eye fatigue and eye discomfort, which can also cause blinking. Three-year-old babies appear frequent blinking, need to be under the guidance of the doctor to clarify the cause, active treatment.