Not all teddy bear manufacturers are alike when it comes to the material used inside of teddy bears. For the most part, many teddy bears are simply filled with cotton and then sewn up. However, there are other teddy bears that are filled with tiny beans. Some are filled with foam. Still others have a mixture of a few different materials inside of them. There is even one manufacturer that allows buyers to place a satin heart inside of the bear before it is sewn up.