Kakashi was literally around 13 when Naruto was born, he would not have a child around Naruto's age when he would have to be around the same age to have him. Gah!!!
Like for reals, there could be a possibility of him impregnating a woman around 13, but come on, Kakashi, while a huge perv, was not that type. He was trained by Naruto's FATHER!! Irritating.
Just, he COULD have a child, but it's highly unlikely.