Dies lustricus
In ancient Rome the dies lustricus ("day of lustration" or "purification day") was a traditional naming ceremony in which an infant was purified and given a praenomen (given name). This occurred on the eighth day for girls and the ninth day for boys, a difference Plutarch explains by noting that "it is a fact that the female grows up, and attains maturity and perfection before the male." Until the umbilical cord fell off, typically on the seventh day, the baby was regarded as "more like a plant than an animal," as Plutarch expresses it.