A more thorough explanation:

Definition: Infans (in-fanz) is a Latin term used in Roman law to refer to a child who is under seven years old. At the age of seven, an infans becomes known as an impubes. An infans has no legal capacity.

• A three-year-old child is considered an infans in Roman law.
• According to Roman law, an infans cannot enter into a contract.

These examples illustrate how an infans is a child who is too young to have any legal capacity. They cannot make decisions or enter into agreements on their own behalf.