If you as the mother are not married to the father of the child and no entries have been made in the custody register, you can request a certificate of sole custody (negative certificate) from the responsible youth welfare office.
A custody register is kept there for children of parents who are not married to each other. Entries are made in this custody register if:

• Declarations of custody are made.
• Custody has been transferred in whole or in part jointly on the basis of a legally binding court decision.
• Custody has been wholly or partially withdrawn from the mother or transferred to the father on the basis of a final court decision.

If no entry has been made in the custody register, you will be issued a written certificate of sole custody.
If entries have been made in the custody register as a result of a court decision that relates to the distribution of parental care, you will receive a written statement that entries have been made in the custody register.