Based on your information, I assume that your child's father was recognised as a refugee or beneficiary of protection in his previous asylum procedure and that you now wish to file an asylum application for your child.
The application for asylum for your child can be submitted in writing and informally to the Federal Office for Migration and Refugees, Frankenstraße 210, 90461 Nürnberg. The application should contain the data and the file numbers of the asylum procedures of you and the father of the child. Your child's birth certificate must be attached.
If you want, you can write that you and the father of your child want to submit an asylum application for your child. It should be enough then.