Involuntary blinking of eyes in toddlers?

Well first off, all blinking is involuntary. If it is constant, then maybe she is having visual problems and can not see properly and might need glasses. Or it could simply be something in her eye that is an irritant.

Take her to a child's optometrist so he can have a look. But keep a small ideal open because it could be a neurological problem that is affecting her vision/eyes.

Schedule a doctor's appointment and see what he/she has to say. I doubt it is an allergy, there most likely would have been eye reddening or skin break out or something mosre noticeable like that. It could also just be that her face muscles are tired or maybe under developed. Check her sleeping at nights and see if she's making it ok through the night.

Sounds like it's not an eye problem but instead a neurology problem since it's her whole face. Take her to her pediatrician, and get his opinion and a referral. Don't get scared though because it may just turn out that this is her new trick, or game. Better safe than sorry!

Could it be stress?? Trying to potty train her? Change in her life?? I babysat a little girl and her mom tried to potty train her too soon and she was doing a weird blinking thing. The mom stopped and so did the blinking.

if it's a twitching habit, take her to her pediatrician he may be able to refer you to a childrens optomatrist

Maybe she's having trouble seeing?

um.... i thought blinking is involuntary....?