V.,
Our youngest, Brycie had a levator resection (basically, they shortened his eyelid to stop it from drooping over his eye) done at 8 months and redone at 11 months. Of course, we were concerned about irritation, pain and him rubbing the eye. But as they explained, the little ones don't seem to be bothered by it, and he was not. Of course, because of the sensitive skin in the eye area, the bruising was a bit of a surprise. And some of the small people tend to be a little grumpy coming out of the anesthesia, but that passes quickly.
You didn't mention which hospital you are using, but Dr. Busse did Brycie's at Childrens' (May be Seton, but I could be remembering wrong) and their scheduling policy is to take children in age order from youngest up, as they don't understand being unable to eat or drink.
Best of luck to you!