The term for a baby kangaroo is "joey." Joeys are born extremely underdeveloped and continue to grow and develop inside their mother's pouch for several months. During this time, they receive warmth and nourishment from their mother's milk. The pouch provides a safe environment for the joey, protecting it while it grows. As the joey matures, it begins to venture out of the pouch but will return for safety and nourishment. This unique reproductive adaptation is key to the survival of kangaroos in various environments.