Newborn ponies were first introduced in Year 5 of the My Little Pony line as Newborn Twins. They were slightly smaller than the baby ponies that had become so popular. Their legs were short and stubby and they had chubby faces and bodies. A second set of Newborn Twins was released in Year 6.
In Year 7, another set of Newborn Ponies was released, but these were sold individually rather than as twins.