Teddy bears that have joints rather than the type that are simply sewn together from the top to the bottom require the use of appropriate joint tools. Among the available tools for the teddy bear joints are cottar pins. Cotter pins use washers and disks to form the joint and keep the limb of a teddy bear in place.
Make a hole through the limb, starting from the inside at the top and to the outside. Put the hole in the limb where it will attach to the body of the teddy bear.
Put the disk and washer on the cottar pin with the disk first and the washer second. Slip the pin with the attached washer and disk into the limb and push it through the hole. The legs of the cottar pin are now outside the limb of the teddy bear.
Put a hole in the body of the teddy bear from the outside at the mark for the limb. Push the cottar pin through the hole, so it is inside the body of the teddy bear. Put another disk and washer with the disk first and washer second on the pin on the inside of the teddy bear body.
Smooth the fabric between the disks, so there are no wrinkles. Bend the cottar pin legs down one at a time over the washer. Use the pliers to bend them. The cottar pin legs will now hold the limb to the body.