The Snug Plug n Play Kids Headphones are made especially for children. They have an adjustable headband, soft ear cushions, and are for ages 3 and up. They will plug in and work for almost any device.
My 10 year old has mostly been using them with his DS. The sound is decent but they are a tad bit small for his ears. He has used them for about 2 weeks and hasn't had any other issues with them. We will be passing them along to friends who have a 4 year old since they are on the small side.
You can find these Snug Plug n Play Kids Headphones on Amazon. They do come in other colors.
* I received this product in exchange for my honest review. Opinions are my own.