Legal Definitions - birth father

Definition: A birth father is the biological father of a child.

For example, if a child is adopted, the birth father is the man who fathered the child but is not raising them.

This term is used to distinguish the biological father from any other father figure in the child's life, such as a stepfather or adoptive father.

Overall, a birth father is the man who contributed his genetic material to the creation of the child, regardless of his involvement in the child's upbringing.