Mildly Interesting story: When my first son was about 3-4 years old, he was the same way. So I figured it was a genetic thing, I shrugged: “hmm that’s mildly interesting…”. And went about my life, and then when he was about 6 years old, mind you , we hadn’t discussed this eye blinking other than in passing, like a few years prior, he came running into my office: “dad, I did it!!!” And I naturally said, “awesome! I’m excited for you, but did what?” “I can wink my right eye, all by itself.”..so he, through practice, was able to train his eye to blink independently….