A baby reindeer is called a calf. They are born in the spring and can start running and playing within a few hours of being born. They are very cute and fluffy, and they have a lot of energy! They follow their mothers around and learn how to survive in the harsh Arctic environment. As they grow, they will start to lose their spots and develop their antlers. By the time they are two years old, they will be fully grown reindeer and ready to join the team!