Posted on May 15, 2015Infiniti Q50 Infiniti Q50 Post navigationPrevious post: Infiniti Q60Next post: Mega Kitten. The word “kitten” derives from the Middle English word kitoun, which in turn came from the Old French chitoun. Kittens develop very quickly from about two weeks of age until their seventh week. Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.