Final answer:
The Greek adage about their newborn children is called the propompe, which was a traditional proclamation made by the father to introduce the child to society. This practice established the child's legitimacy, legal rights, and social identity.
Step-by-step explanation:
The Greek adage about their newborn children is often referred to as the propompe. It was a traditional announcement or proclamation made by the father of the child, usually done in the presence of witnesses or relatives. The purpose of the propompe was to officially introduce the newborn to society and establish its legitimacy within the community.
This practice was significant because it ensured that the child would have legal rights and protections, including the right to inherit property and the possibility of becoming a citizen. It also solidified the child's social identity and connection to its father and family.