The first contact for safety issues is the police authority (call number 110). The Youth Welfare Office with the ASD (General Social Service) is the contact person for a possible risk to the child's well-being (§ 8a SGB VIII).
Contact persons in Bremen:
Office for Social Services, Child and Youth Protection Telephone: 0421 - 6 99 11 33
Child Protection Center Bremen: 0421 - 240112-20