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Child car seats: which one, which way round, until when

Child car seats: which one, which way round, until when: the two parallel systems explained once and properly — UN R129 (i-Size, by height) against the…

This launch guide maps the topic, the source base and the practical questions. Check the linked official authority before acting on a rule, deadline, price or safety requirement.

What this guide covers

The two parallel systems explained once and properly — UN R129 (i-Size, by height) against the withdrawn R44 (by weight) — with a page per height band, per install method (ISOFIX, top tether, support leg, belt route) and per national rule. Item pages include the minimum rearward-facing age, booster height thresholds in EE/FI/LV, the front seat and airbag rule, second-hand seats and crash history, and the winter-coat harness slack demonstrated with published sled tests — 16+ pages.

One focused section asks: "Rearward-facing until when, and what the law says in each country".

How to use it

Use Child car seats: which one, which way round, until when to understand the inputs, units and assumptions before relying on an output. A useful result should be reproducible from the named source rather than presented as an unexplained score.

The page keeps the main question, its evidence base and its limits together in one canonical place. That makes it useful as a quick orientation and avoids splitting a broad subject into shallow pages before each narrower answer has enough verified material of its own.

Search vocabulary in four languages

Terminology changes across borders. These are example phrases people use for the same subject in Estonian, Finnish, Russian and English; they are included as a practical vocabulary aid, not as hidden keywords.

Evidence and provenance

The evidence map below records the primary, official or openly licensed material chosen for this guide. It is deliberately visible so a reader can tell the difference between a rule published by an authority, a measured dataset and an editorial explanation.

Source: UN Regulations 44 and 129 full texts (UNECE, free), Liiklusseadus §33-35 (Riigi Teataja, reusable), Tieliikennelaki child-restraint sections (Finlex, free), Transpordiamet and Traficom guidance. · checked 2026-09-09

Source names are preserved even where an authority changes its web address. No figure is added to this launch page unless it is already present in the cited source description or can be computed from a named dataset.

Scope and boundaries

This guide owns the explanatory layer for the topic. Personal decisions, diagnoses, legal determinations and live availability remain with the relevant professional or official service.

Connected TempoLife guides

The following paths are the intentional hand-offs named in the brief. They keep adjacent subjects separate while making the next useful reference easy to find.

Why it belongs on TempoLife

/drivers, /baby, /child-growth.

Frequently asked questions