A 10-month-old baby blinking hard may be caused by foreign bodies in the eye, impingement or conjunctivitis. 1. Foreign body in the eye: it may be due to sandy weather, sand, dust and other foreign bodies into the eye to trigger a strange feeling, resulting in the baby blinking hard. 2. Inverted eyelashes: Babies suffering from inverted eyelashes may cause the eyelashes to irritate the cornea constantly, thus causing the situation of blinking vigorously, and may be accompanied by symptoms such as tearing. 3. Conjunctivitis: eye diseases such as conjunctivitis may cause the conjunctiva to be stimulated by inflammation, which will lead to eye discomfort and thus the phenomenon of blinking hard. 10-month-old babies blinking vigorously may also be other reasons, it is recommended to consult a doctor in time, with the help of a doctor to clarify the cause of the disease, and targeted treatment or treatment.