The copper coins worn by children at birth can be taken off in a hundred days, but they were broken only a hundred days ago. What happened?

The phenomenon of "broken" can only occur on copper coins with a long history or serious corrosion, and generally it is "bent" at most. As for what happened, it's hard to say. It may have been accidentally broken, or someone may have crushed it too hard. Of course, you mean superstition. Superstition is false and unreliable. Don't mind too much.