We get asked all the time, these are not Voodoo Dolls.
These are Worry Dolls, their purpose is to serve you, a love one, child etc. to help ease and take away their worry. Children tend to worry just as much as adults and we do not realize it. Keep these with you as if they are your crystals or personal belongings. Place these under your pillow at with or without an Amethyst to aid with sleep and calmness. 
Each pack comes with 6. One pack can be shared within the whole family, work, friends, kids etc.