ECE R44/04  | ECE R129 (i-Size)  | 
Classification based on child’s weight (in kg)  | Classification based on child’s height (in cm)  | 
Categorised by groups (Group 0+, 1, 2, 3)  | No groups  | 
Child can be forward facing from 9 kg  | Child must rear face to a minimum of 15 months  | 
Can be used for seat belt or ISOFIX seats  | Can only be used for ISOFIX  | 
Rear and front impact testing  | Rear, front and side impact testing  | 
P dummy used in crash tests with 4 sensors  | Q dummy used in crash tests with 32 sensors  |