The replacement child or replacement child syndrome became popular in periods of high infant mortality. But it continues in modern times in some places. In some religions and cultures, it was bad luck to mention a dead child's name. Even among European royal families, a dead child was often referred to by his or her title and not their name. Among the replacement children of Holocaust the names of the dead were often not spoken of. The name was memorialized in the replacement child (because they were alive the name could be used). 