Four years old, huh? Everyone keeps telling me they'll stay that way because she's 6 months old. I guess that's not true. I don't think there have been any studies on the matter. We'll just have to wait and see, I guess.
My three sisters and I all had blue eyes when we were born and they did not fully change until we were 6 or 7. My oldest sister has hazel eyes and the rest of us have brown. We also all had blond hair until we were 4 and now we all have dark brown hair.
My son who turns 9 in September had blue eyes till he was 4 when they started changing. They are brown now also.