Two and a half year old children with frequent blinking symptoms, need to be more observation, may be a foreign body in the eye irritation and other physiological factors, may also be suffering from inverted eyelashes, conjunctivitis, Tourette’s syndrome and other causes of the cause of the child. 1. Physiological factors: the child’s eyes fell into the foreign body, such as dust, eyelashes, etc., resulting in eye itching, thus appearing to blink frequently to ease the discomfort, after the removal of triggers can be returned to normal. 2. Inverted eyelashes: children with inverted eyelashes, eyelashes grow inward, resulting in contact and friction between the eyelashes and the eyeball, causing itching and frequent blinking. 3. Conjunctivitis: Conjunctivitis is an inflammatory disease that occurs in the conjunctiva, mostly caused by microbial infections, allergies, etc. It mostly manifests itself in discomfort such as itchy eyes, tearing and increased secretion, which leads to frequent blinking of the baby’s eyes. 4. Tourette’s syndrome: Tourette’s syndrome is a mental disorder that mostly occurs in children, and children with the disorder can mainly manifest as frequent blinking, throat clearing, nose sucking, shrugging and shaking, and other involuntary symptoms. Parents should pay more attention to their children’s eye hygiene and clean up eye secretions in time. If your child has frequent blinking symptoms, you should bring your child to the doctor in time after eliminating physiological factors.