Detailed description
If you are married to the child's mother at the time of the child's birth, you are generally automatically considered the child's father under German law. In this case, acknowledgment of paternity is not necessary. If you are not married to the child's mother at the time of the birth, but want to be recognized as the child's father, you can submit acknowledgment of paternity. In some cases, acknowledgment of paternity may also be necessary if the law of another country applies to your father-child relationship.
If you wish to acknowledge paternity, you must declare this to the relevant authority. The relevant authority will publicly certify your paternity if all requirements are met.