When a married couple has a baby the state of Oklahoma automatically assumes the husband is the legal father. However, this presumption of paternity is not extended to unmarried couples. This means if an unmarried couple has a baby the biological father is not assumed to be the legal father unless the couple legally establishes paternity.
How to Establish Paternity in Oklahoma
Unmarried couples can sign an Acknowledgment of Paternity (AOP) or if a lawsuit is involved, a judge will declare paternity.
If couples choose to sign an AOP many of them will do so at the hospital or birthing center. Most hospitals will be equipped with the necessary personnel and paperwork to properly complete the AOP.