The natural filiation characterizes the newborns except Mariage.

It is about the filiation of the fault . In many cases the children do not have the same rights as the legitimate children. The parents are also aimed. The man can be more easily excluded from his paternity and disavow the child. The woman can be excluded from her social group. However, in Western civilizations, it is generally about a choice, related to a life mode: the Cohabitation.

After the French revolution, between 1789 and 1804, one notes important modifications as for the right of the family, of which attribution with the natural children of rights equal to those of the legitimate children.