How do I get my chihuahua puppy to stop biting?

Hi my dog almost 2 months old. I know she is just a puppy but the biting us is killing me. We replace our hands or feet with a toy and tell her no but she goes right back to biting. Not only does it hurt but im afraid she is going to be aggressive to us and others and I want to avoid that. I would appreciate your advice.
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