Twin beds are the optimal bed size for a child's room. Twin beds can last your child a lifetime and grow as they do; use a twin bed as a toddler bed, and then they can use it until they are off to college. Twin beds don’t take up a lot of space, making them ideal for a young child's room, where they need space to play, or a teen's room, where they need space for a desk so they can study. Twin beds give you the freedom to add more bedroom furniture for additional storage or decoration. For even more space, try a twin loft bed.