The embarrassing period for British shorthair cats is 3-8 months after birth. This is an important stage of development of cats. During this period, the cat will go through important changes such as growing up, replacing the fetal hair, and widening the head. This period is the appearance of the British shorthair cat. The ugliest one will be a chubby and cute cat after 8 months. The owner should strengthen nutritious food during this period to help the British shorthair develop better.