Eileen Karsh established that the window of the sensitive period for habituating kittens to people is from two weeks to seven weeks. Cats handled regularly during this time were prepared, when older, to stay on someone's lap longer and approach people more readily. Cats that were handled after this period, that is from weaning on wards, behaved no differently from cats that had not been handled at all. …All too often, as young kittens they will not have been handled regularly. Brought into new homes where they are the focus of attention they receive lots of handling, yet it seems this will not socialize them as well as the little time spent each day before weaning.