This is scary, but I thought I'd post as a warning. My cousin's 3-year-old daughter's eye suddenly crossed this past weekend. The doctors think it's a viral reaction to the H1N1 (mist) vaccine. The same think happened to her a couple of years ago, and it turned out it was right after she got a flu shot, but no one made the connection then. Obviously this isn't a common reaction, but you may want to ask your doctor about it.