The leg joints of the doll I received are very stiff and difficult to move. Is this normal?

If the skeleton seems difficult to move, this is because you received a relatively new doll. During the production process, the factory slightly tightens the joints. This is because the oil in the doll's skin lubricates the joints, gradually loosening them. If the joints aren't tightened properly during production, the lubrication may cause them to become loose and difficult to secure after repeated use, making it difficult for the doll to maintain poses.

This is also done to ensure the durability of the skeleton. Therefore, when you first receive the doll, the skeleton may be a little stiff and difficult to adjust. However, after a few uses using the skeleton correctly, it will become more flexible.

Furthermore, there are limitations to the movement range of the skeleton, excessive movement can damage the skeleton. For more information on skeletons, please refer to "skeleton movement range".