How long must a child use a car seat?
Until the child reaches 150 cm — age no longer comes into it. This is the most widespread misconception among Slovak parents: the condition of turning 12, which many people remember, no longer applies. What decides today is height and weight: a car seat or booster is mandatory for every child who has not reached 150 cm or does not weigh more than 36 kg. So a small fourteen-year-old must sit on a booster, while a tall ten-year-old need not. The obligation comes from Act 554/2006 on the compulsory use of seat belts and child restraint systems. In practice: around age 5 and 15 kg a child is usually ready to move to a booster.
📋 The rules
- What decides is height, not age — the line is 150 cm
- The age-12 condition no longer applies
- A seat is also required below 36 kg
- The rule is in Act 554/2006
- The fine: €50 – €100
🔓 Exceptions
- The move to a booster is usually suitable around age 5 and 15 kg
- A child may sit in front only in a seat, and rear-facing only with the airbag off
- In administrative proceedings the sanction can exceed the on-the-spot fine
⚠️ Penalties & fines
Carrying a child without a seat or booster is a fine of €50 to €100, and more in administrative proceedings. But the part people miss matters more: a seat belt is engineered for an adult. On a child under 150 cm the belt crosses the neck instead of the shoulder and the abdomen instead of the pelvis — and that is precisely what causes the gravest injuries in a collision. A booster is not a formality; it raises the child so the belt runs where it should. Do not go by the child's age: what decides is a metre and a half, and until the child reaches it, a seat or booster is compulsory.
📎 Official sources
❓ Frequently asked
Does the age-12 threshold still apply?
No, and it is the commonest error. The condition of turning 12 is gone — what decides is a height of 150 cm and a weight of 36 kg. A smaller older child therefore still needs a booster, even past their twelfth birthday.
How long is a seat required?
Until the child reaches 150 cm in height or exceeds 36 kg in weight. Only then may they use the seat belt alone. Until that point a seat or booster is required on every journey, however short.
When should we move from a seat to a booster?
Experts broadly agree that a child's skeleton is developed enough for a booster around the age of five, weighing 15 to 36 kg. It is not a compulsory milestone, though — a seat with a backrest remains safer for as long as the child fits it.
What is the fine?
Carrying a child without a seat is a fine of €50 to €100, and possibly more in administrative proceedings. It falls on the driver, not the parent sitting in the back — so it applies when you are carrying someone else's child too.
Why a booster at all?
A seat belt is engineered for an adult. On a child under 150 cm it runs across the neck instead of the shoulder and across the abdomen instead of the pelvis. A booster raises the child so the belt runs correctly and does not cause severe injury in a crash.
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