Not Worth It
It does not sound like it is heavy, but wearing an extra five pounds around your neck all the time can certainly be exhausting. Sydney is special because I think this would be torture for almost anyone else.
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Medical Issues
An orthopedic surgeon from Southern California recommends not doing this since it can damage the nerves located in the neck. Also, he says that given her age, she is done growing and at this point, she is just stretching her skin.