I’m not sure if manufacturers should keep encouraging kids to wear headphones at such a young age but nonetheless they still keep coming out.  Wireless Car Headphones for Kids from Kidz Gear is designed specifically for in-car DVD and video systems. Manufactured with IR wireless technology, they have kid sized headbands, comfortably padded ear-cups, automatic power-off, volume control on the ear-cup, and compatibility with all U.S. cars that support a built-in IR DVD or video system. Kidz Gear Wireless Car Headphones for Kids $34.99.