The baby four-year-old eyes frequently blinking consider is eye overstrain, inverted eyelashes and allergic conjunctivitis and other causes. 1. Eye fatigue: if the four-year-old baby long-term look at electronic products and other situations will appear eye fatigue, may cause the child often blinking, but also can be accompanied by eye dryness, soreness and other symptoms of discomfort. 2. Inverted eyelashes: If a four-year-old baby suffers from inverted eyelashes, the eyelashes are inverted to the eyeball, long-term stimulation of the cornea and conjunctiva, may also lead to frequent blinking of the baby’s eyes, but also can be accompanied by eye pain, eye redness and other symptoms of discomfort. 3. Allergic conjunctivitis: If a four-year-old baby is allergic, exposure to air pollen, irritating foods and other allergic factors can lead to allergic conjunctivitis, resulting in frequent blinking of the eyes. It is recommended that children with frequent blinking accompanied by other discomforts consult a doctor promptly to assess their condition and follow the doctor’s instructions for treatment.