15-day-old kittens are still in the newborn stage, and their hair may not be developed enough, so it is difficult to distinguish between long-haired and short-haired breeds based on the length of the hair. Typically, the length and texture of a kitten's coat will become apparent as they grow.

However, there are some basic characteristics that can help us initially judge whether a kitten may be Long-haired or short-haired breed: - Kittens of the long-haired breed are usually born with noticeably longer hair, which may appear slightly wavy and relatively smooth. - Short-haired kittens may have short and thick hair at birth. As the body dries, the hair on the nape of the neck will stand up, and the hair on the forehead will also become upright.