The hair of British shorthair kittens before molting varies in length, has no luster, and looks thinner. However, the hair after molting is smoother, shiny, and longer. The change is very obvious, and it can usually be seen with the naked eye. Observe it. British Shorthair kittens usually start to shed their hair when they are about 4 months old, and they will completely change their hair when they are about 8 months old. After that, they will also shed their hair every spring and autumn.