The British Shorthair begins to grow rapidly 3 months after birth and will continue to grow until 10 months old. This period is a critical period for the physical development of British Shorthair cats. During this period, owners should strengthen nutritional supplements and give more British Shorthair cats eat high-protein foods such as meat, canned food, and eggs. Male short cats can eat raw meat and bones when they are 5 months old to help their faces grow gills and gain weight.