SAFETY SYSTEM FOR A CHILD SEAT'S SEATBELT SYSTEM, RETENTION SYSTEM FOR A CHILD SEAT, SEATBELT SYSTEM, VEHICLE AND USE OF A REMOTE DETECTOR

The disclosure relates to a safety system (30) for a child seat's (24) seatbelt system (26). The safety system (30) comprises an occupancy detection unit (32) being configured to detect a presence of a child (28) in the child seat (24) and a fastening status detection unit (34) being configured to detect a fastening status of the seatbelt system (26). Moreover, the safety system (30) comprises a notification unit (36) being communicatively connected to the occupancy detection unit (32) and the fastening status detection unit (34). The notification unit (36) is configured to issue a notification if a presence of a child (28) is detected and the fastening status is detected to be non-fastened. At least one of the occupancy detection unit (32) and the fastening status detection unit (34) comprises a remote detector (40). Furthermore, a retention system (48) for a child seat (24) is described. The retention system (48) comprises a seatbelt system (26) and a safety system (30). Additionally, a seatbelt system (26), a vehicle (10) and a use of a remote detector (40) for detecting a presence of a child (28) in a child seat (24) and/or for detecting a fastening status of a seatbelt system (26) are presented.