Hey Sukie. Typically, kits open their eyes at approximately 4= weeks of age. Although, some may vary in either direction, four and a half weeks tends to be the norm. I have had kits open them later (my last two litters, one had eyes open at 4= weeks, the other their eyes opened at 5= weeks) Personally, I've never had any open sooner, but have heard of it happening. Hope this helps :o) Sam [Posted in FML issue 2418]