Proposal to clarify the requirements for the type approval category of booster seats over 135 cm, to update a reference with the new European Committee for Standardization (CEN) published EN 71-3:2019 on 10 April 2019, to delete a cut-and-paste error in Annex 6, Appendix 2 taken from UN R44 referring to ECRS as in the “restricted” category which does not exist in UN R129, and to reconcile and consolidate various references to tolerances for the internal geometry assessment.