I have one for my baby, it seems to help him. He's fussier without it. I don't let him sleep with it however. It needs to be tight enough so that it can't go in the mouth but not so tight that it touches the neck all the way around. I only allow the ones that screw closed and that are individualy knotted after each bead, this way if it breaks the beads don't fall off the cord and become a hazard.

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