According to the European safety standard ECE R44/04, car seats are subdivided into 5 groups to allow for correct use:
| Group 0: | birth up to 10 kg |
| Group 0+: | birth up to 13 kg |
| Group 1: | 9-18 kg |
| Group 2: | 15-25 kg |
| Group 3: | 22-36 kg |
According to the European safety standard ECE R44/04, car seats are subdivided into 5 groups to allow for correct use:
| Group 0: | birth up to 10 kg |
| Group 0+: | birth up to 13 kg |
| Group 1: | 9-18 kg |
| Group 2: | 15-25 kg |
| Group 3: | 22-36 kg |