@ChocolateReigns
The placebo effect can work on the mother, too. There may be no discernible change in the baby’s cries, but mom may not be as bothered by them, may attribute them to other causes… or the baby’s teething process has advanced naturally to a point where it’s no longer uncomfortable.
To answer the OP, everything will work for a certain percentage of people. It’s why double-blind studies are needed to “prove” effectiveness, where neither the tester nor the subject knows whether the bracelet being placed on the subject’s wrist is magnetic or not. Even in double-blind tests, some people claim “improvement” in their situation – whether they were ‘treated’ with the magnetic or non-magnetic bracelet. The proof of effectiveness is when a statistically significant group of subjects notices improvement, and the experiment can be repeated with similar populations and obtain similar results.