Hi, How old is your baby? He blink one eye or both?
My niece also had this problem before. She kept blinking one of her eye, later we found out that she got lazy eye. Need to be correct as soon as possible, if not in future, the eye can't be use anymore, which mean blind on 1 eye.
If you think your baby is in this case, then quickly bring her to a specialist for a check. If you need any recommendation on that i can check with my sister which specialist she goes to.